outcast vs leper

outcast and leper both are nouns.

Word	Noun	Adjective	Verb	Adverb
outcast	Yes	Yes	No	No
leper	Yes	No	No	No

As nouns, leper is a hyponym of outcast; that is, leper is a word with a more specific, narrower meaning than outcast:

Other hyponyms of outcast include heretic, misbeliever, religious outcast, Harijan, untouchable.

outcast (noun)	leper (noun)
a person who is rejected (from society or home)	a pariah who is avoided by others
	a person afflicted with leprosy

outcast (adjective)	leper (adjective)
excluded from a society