manful vs male

manful is not a noun while male is a noun.

Word	Noun	Adjective	Verb	Adverb
manful	No	Yes	No	No
male	Yes	Yes	No	No

As adjectives, manful and male are synonyms defined as:

Other synonyms of manful include manlike, manly, virile.

manful (noun)	male (noun)
	an animal that produces gametes (spermatozoa) that can fertilize female gametes (ova)
	a person who belongs to the sex that cannot have babies

manful (adjective)	male (adjective)
possessing qualities befitting a man	being the sex (of plant or animal) that produces gametes (spermatozoa) that perform the fertilizing function in generation
characteristic of a man	for or pertaining to or composed of men or boys
	characteristic of a man