What Is Their Difference?
What is the difference in meaning when we add the adverb 'else' to the indefinite pronoun 'someone'? To find out the difference between the two, read this part!
Someone vs. Someone Else
Consider these two sentences:
'Someone' is the more formal synonym of 'somebody'. It refers to a person who is not known or mentioned by name.
'Else' is an adverb that adds a sense of exclusion and it means 'other than the persons mentioned or involved'.
'Someone else' is someone apart from those mentioned or implied.
Bottom line, we can conclude that:
someone → any person
someone else → another person