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Irregular Words - Multiple Plural Forms

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Categorized English Irregular Words
antenna
antenna
[noun]

one of a pair of jointed sensory appendages on the head of insects, crustaceans, or similar organisms, often used to detect touch, taste, or movement

Ex: The ant waved its antenna as it explored the ground. 
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apex
apex
[noun]

the topmost point of something

Ex: She reached the apex of the mountain after a challenging climb. 
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appendix
appendix
[noun]

a sack of tissue that is attached to the large intestine and is surgically removed if infected

Ex: An inflamed appendix can cause severe abdominal pain and fever. 
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beau
beau
[noun]

a man romantically involved with someone

Ex: Letters between the two revealed the depth of affection she held for her longtime beau. 
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bureau
bureau
[noun]

a desk with drawers and a hinged writing surface on top

Ex: He sat at the bureau to write letters. 
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cactus
cactus
[noun]

a desert plant with a lot of spines on a thick stem that stores water

Ex: A cactus can live for many years with proper care. 
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buffalo
buffalo
[noun]

the large, shaggy-haired brown bison native to the North American plains

Ex: A herd of buffalo grazed on the prairie. 
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curriculum

the overall content, courses, and learning experiences designed by educational institutions to achieve specific educational goals and outcomes for students

Ex: The school's curriculum includes core subjects like math, science, and language arts, as well as elective courses in arts and music. 
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dwarf
dwarf
[noun]

a fictional, small human-like creature that generally lives under the ground and works in mines

Ex: In fairy tales, dwarfs are often portrayed as skilled miners who live underground. 
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formula
formula
[noun]

(mathematics) a rule or law represented in symbols, letters, or numbers

Ex: The quadratic formula provides a method for finding the roots of a quadratic equation. 
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fungus
fungus
[noun]

a plant-like organism that often grows on organic matter and has no flowers or leaves, such as moulds and mushrooms

Ex: They discovered a new species of fungus in the rainforest that glows in the dark. 
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genus
genus
[noun]

(biology) any of the groups that plants, animals, etc. with similar characteristics are divided into, which is larger than a species and smaller than a family

Ex: The genus Rosa includes all the species of roses, known for their beautiful flowers and fragrance. 
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hoof
hoof
[noun]

the horny and hard part at the end of a limb of a mammal, such as a horse

Ex: He noticed a small stone stuck in the horse's hoof while brushing it. 
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index
index
[noun]

a system that provides the amount of prices, costs, etc. so that one can compare them with their previous value

Ex: The Consumer Price Index (CPI) is used to measure inflation by comparing current prices to those of a base year. 
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matrix
matrix
[noun]

a rectangular array of numbers or symbols organized in rows and columns, commonly used in linear algebra for representing equations, transformations, and vector operations

Ex: A 2x3 matrix represents a collection of numbers organized in two rows and three columns. 
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medium
medium
[noun]

a means that is used for the purpose of communicating or expressing something

Ex: Art is a powerful medium for expressing emotions. 
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memorandum

a written message or communication, often used within an organization, to convey information, directives, or agreements to employees or stakeholders in a concise and formal manner

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Nebula
Nebula
[noun]

a glowing cloud of gas and dust in outer space, often the result of a star explosion or formation

Ex: The Orion Nebula is a famous example of a stellar nursery. 
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opus
opus
[noun]

a musical piece or collection that is written by a famous composer followed by the date in which it was created

Ex: Rachmaninoff's "Piano Concerto No. 2, Opus 18" was completed in 1901. 
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plateau
plateau
[noun]

an area of land that is flat and higher than the land surrounding it

Ex: The Colorado Plateau is known for its stunning landscapes, including deep canyons and colorful rock formations. 
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radius
radius
[noun]

the length of a straight line drawn from the center of a circle to any point on its outer boundary

Ex: The radius of a circle is half the length of its diameter, extending from the center to any point on the circumference. 
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referendum

a vote in which all the people of a country are asked to decide on one political question

Ex: Many people voted in the referendum. 
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scarf
scarf
[noun]

a piece of cloth, often worn around the neck or head, which can be shaped in a square, rectangular, or triangular form

Ex: She wrapped a cozy scarf around her neck to shield herself from the biting winter wind. 
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syllabus
syllabus
[noun]

a document that outlines the topics, assignments, and expectations for a course

Ex: The syllabus for the English Literature course includes readings from classic novels, poetry, and drama. 
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symposium
symposium
[noun]

a conference or meeting where experts discuss a particular topic or set of topics

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vertex
vertex
[noun]

the highest point or peak of something

Ex: The mountaineers reached the vertex of the mountain after a grueling climb. 
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vortex
vortex
[noun]

a swirling mass of fluid with a rotating motion, often forming a funnel shape

Ex: As the bathtub drain opened, a small vortex formed, illustrating the simple yet mesmerizing nature of fluid dynamics. 
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wharf
wharf
[noun]

a structure built along the water's edge; often with a platform for ships to load and unload goods

Ex: We walked along the wharf to admire the view of the harbor. 
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hippopotamus

a large African mammal with a thick gray skin, big jaws and tusks that lives near water

Ex: The baby hippopotamus swam beside its mother. 
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aquarium
aquarium
[noun]

a large container usually made of glass that is filled with water in which fish and other sea creatures are kept

Ex: We bought a small aquarium for our goldfish and decorated it with plants. 
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codex
codex
[noun]

an ancient book, written by hand, especially of scriptures, classics, etc.

Ex: The museum's prized exhibit is an illuminated codex from the medieval period, featuring intricately detailed illustrations and calligraphy. 
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