female offspring vs female

female offspring and female both are nouns.

Word	Noun	Adjective	Verb	Adverb
female offspring	Yes	No	No	No
female	Yes	Yes	No	No

As nouns, female is a hypernym of female offspring; that is, female is a word with a broader meaning than female offspring:

Other hypernyms of female offspring include female person, child, kid.

female offspring (noun)	female (noun)
a child who is female	an animal that produces gametes (ova) that can be fertilized by male gametes (spermatozoa)
	a person who belongs to the sex that can have babies

female offspring (adjective)	female (adjective)
	being the sex (of plant or animal) that produces fertilizable gametes (ova) from which offspring develop
	for or pertaining to or composed of women or girls
	characteristic of or peculiar to a woman