vassalage vs thraldom

vassalage and thraldom both are nouns.

Word	Noun	Adjective	Verb	Adverb
vassalage	Yes	No	No	No
thraldom	Yes	No	No	No

As nouns, thraldom is a hypernym of vassalage; that is, thraldom is a word with a broader meaning than vassalage:

Other hypernyms of vassalage include bondage, slavery, thrall, thralldom.

vassalage (noun)	thraldom (noun)
the state of a serf	the state of being under the control of another person