fella vs male

fella and male both are nouns.

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

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

Other hypernyms of fella include male person.

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

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