weakling vs somebody

weakling and somebody both are nouns.

Word	Noun	Adjective	Verb	Adverb
weakling	Yes	No	No	No
somebody	Yes	No	No	No

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

weakling: a person who is physically weak and ineffectual
somebody: a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential

Other hypernyms of weakling include individual, mortal, person, someone, soul.

weakling (noun)	somebody (noun)
a person who is physically weak and ineffectual	a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential