peasant vs rustic

peasant and rustic both are nouns.

Word	Noun	Adjective	Verb	Adverb
peasant	Yes	No	No	No
rustic	Yes	Yes	No	No

As nouns, rustic is a hypernym of peasant; that is, rustic is a word with a broader meaning than peasant:

peasant (noun)	rustic (noun)
a country person	an unsophisticated country person
a crude uncouth ill-bred person lacking culture or refinement
one of a (chiefly European) class of agricultural laborers

peasant (adjective)	rustic (adjective)
	awkwardly simple and provincial
	characteristic of the fields or country
	characteristic of rural life