mesomorph vs someone

mesomorph and someone both are nouns.

Word	Noun	Adjective	Verb	Adverb
mesomorph	Yes	No	No	No
someone	Yes	No	No	No

As nouns, someone is a hypernym of mesomorph; that is, someone is a word with a broader meaning than mesomorph:

mesomorph: a person with a well-developed muscular body
someone: a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential

Other hypernyms of mesomorph include individual, mortal, person, somebody, soul.

mesomorph (noun)	someone (noun)
a person with a well-developed muscular body	a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential