helot vs villein

helot and villein both are nouns.

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

As nouns, helot and villein are synonyms defined as:

helot and villein: (Middle Ages) a person who is bound to the land and owned by the feudal lord

Other synonyms of helot include serf.

helot (noun)	villein (noun)
(Middle Ages) a person who is bound to the land and owned by the feudal lord	(Middle Ages) a person who is bound to the land and owned by the feudal lord