vassal vs liege

vassal and liege both are nouns.

Word	Noun	Adjective	Verb	Adverb
vassal	Yes	No	No	No
liege	Yes	Yes	No	No

As nouns, vassal and liege are synonyms defined as:

vassal and liege: a person holding a fief; a person who owes allegiance and service to a feudal lord

Other synonyms of vassal include feudatory, liege subject, liegeman.

vassal (noun)	liege (noun)
a person holding a fief; a person who owes allegiance and service to a feudal lord	a person holding a fief; a person who owes allegiance and service to a feudal lord
	a feudal lord entitled to allegiance and service

vassal (adjective)	liege (adjective)
	owing or owed feudal allegiance and service