Those two words sound alike don't they? A great (and funny) discussion came up in class about this. In a dialogue activity, "I want some butter." was pronounced "I want somebody."
Then, we talked about all of the words that end in 'body'
This week, pay attention to how often you say the word 'some' and how often you say 'someone' or 'somebody'. This is a word English learners hear a lot but can't always discern.