fella vs blighter

fella and blighter both are nouns.

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

As nouns, fella and blighter are synonyms defined as:

Other synonyms of fella include bloke, chap, cuss, feller, fellow, gent, lad.

fella (noun)	blighter (noun)
a boy or man	a persistently annoying person
	a boy or man