Are synonyms not interchangeable? If I look them up in Longman Dictionary of Contemporary English (5th edition) I get the same definition, however, we know that no two words means exactly the same (not even couch and sofa ).

What’s more, if we use Merriam-Webster’s dictionary for finding out how to differentiate, there might be some.

someone’s hoping

that someone will suddenly find out – Contemporary Review, then you meet someone… people you like – John Van Druten somebody’s one or some

person’s no

certain or known identity: a person indeterminate if you leave the door open somebody will be sure to come in there should be somebody at this hour somebody’s a person of position or importance think oneself

a somebody

– often used without article, the desire to be somebody is