thrall vs villein

thrall and villein both are nouns.

Word	Noun	Adjective	Verb	Adverb
thrall	Yes	No	No	No
villein	Yes	No	No	No

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

thrall: someone held in bondage
villein: (Middle Ages) a person who is bound to the land and owned by the feudal lord

Other hyponyms of thrall include helot, serf.

thrall (noun)	villein (noun)
someone held in bondage	(Middle Ages) a person who is bound to the land and owned by the feudal lord
the state of being under the control of another person