male offspring vs boy

male offspring and boy both are nouns.

Word	Noun	Adjective	Verb	Adverb
male offspring	Yes	No	No	No
boy	Yes	No	No	No

As nouns, boy is a hyponym of male offspring; that is, boy is a word with a more specific, narrower meaning than male offspring:

Other hyponyms of male offspring include son.

male offspring (noun)	boy (noun)
a child who is male	a youthful male person
	(ethnic slur) offensive and disparaging term for Black man
	a friendly informal reference to a grown man
	a male human offspring