'oo' is a digraph that produces a new sound. We are going to know more about it here.

Digraphs are a set of two letters that stand together and produce a new sound.

Digraph

oo

Name

oo (pronounced /ˈoʊ ˈoʊ/)

Common Sound(s)

/uː/, /ʊ/, /ʌ/, /ɔ:/

ThumbnailPhoto

The Digraph 'oo'

Sound 1: /uː/

'oo' in the middle of words mainly sounds /uː/:

Example

tooth /tθ/

broom /brm/

spoon /spn/

Sound 2: /ʊ/

'oo' in the middle of words also sounds short /ʊ/:

Example

foot /fʊt/

hook /hʊk/

book /bʊk/

Sound 3: /ʌ/

'oo' in the middle of words sounds /ʌ/ in some words:

Example

blood /blʌd/

flood /flʌd/

Sound 4: /ɔ:/

'oo' in the middle of words and always before 'r' can also sound /ɔ:/. So 'oor' always sounds /ɔːr/.

Example

door /dɔːr/

floor /flɔːr/

moor /mɔːr/

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