multiplication vs facts of life

multiplication and facts of life both are nouns.

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

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

multiplication: the act of producing offspring or multiplying by such production
facts of life: the sexual activity of conceiving and bearing offspring

Other hypernyms of multiplication include breeding, procreation, reproduction.

multiplication (noun)	facts of life (noun)
an arithmetic operation that is the inverse of division; the product of two numbers is computed	the sexual activity of conceiving and bearing offspring
the act of producing offspring or multiplying by such production
a multiplicative increase