crossbreeding vs facts of life

crossbreeding and facts of life both are nouns.

Word	Noun	Adjective	Verb	Adverb
crossbreeding	Yes	No	No	No
facts of life	Yes	No	No	No

As nouns, facts of life is a hypernym of crossbreeding; that is, facts of life is a word with a broader meaning than crossbreeding:

crossbreeding: reproduction by parents of different races (especially by white and non-white persons)
facts of life: the sexual activity of conceiving and bearing offspring

Other hypernyms of crossbreeding include breeding, procreation, reproduction.

crossbreeding (noun)	facts of life (noun)
(genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids	the sexual activity of conceiving and bearing offspring
reproduction by parents of different races (especially by white and non-white persons)