pater vs male parent

pater and male parent both are nouns.

Word	Noun	Adjective	Verb	Adverb
pater	Yes	No	No	No
male parent	Yes	No	No	No

As nouns, male parent is a hypernym of pater; that is, male parent is a word with a broader meaning than pater:

pater: an informal use of the Latin word for father; sometimes used by British schoolboys or used facetiously
male parent: a male parent (also used as a term of address to your father)

Other hypernyms of pater include begetter, father.

pater (noun)	male parent (noun)
an informal use of the Latin word for father; sometimes used by British schoolboys or used facetiously	a male parent (also used as a term of address to your father)