serf vs helot

serf and helot both are nouns.

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

As nouns, serf and helot are synonyms defined as:

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

Other synonyms of serf include villein.

serf (noun)	helot (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