right hander vs somebody

right hander and somebody both are nouns.

Word	Noun	Adjective	Verb	Adverb
right hander	Yes	No	No	No
somebody	Yes	No	No	No

As nouns, somebody is a hypernym of right hander; that is, somebody is a word with a broader meaning than right hander:

right hander: a person who uses the right hand more skillfully than the left
somebody: a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential

Other hypernyms of right hander include individual, mortal, person, someone, soul.

right hander (noun)	somebody (noun)
a person who uses the right hand more skillfully than the left	a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential