villein vs serf

villein and serf both are nouns.

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

As nouns, villein and serf are synonyms defined as:

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

Other synonyms of villein include helot.

villein (noun)	serf (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