thane vs citizen

thane and citizen both are nouns.

Word	Noun	Adjective	Verb	Adverb
thane	Yes	No	No	No
citizen	Yes	No	No	No

As nouns, citizen is a hypernym of thane; that is, citizen is a word with a broader meaning than thane:

thane: a man ranking above an ordinary freeman and below a noble in Anglo-Saxon England (especially one who gave military service in exchange for land)
citizen: a native or naturalized member of a state or other political community

thane (noun)	citizen (noun)
a man ranking above an ordinary freeman and below a noble in Anglo-Saxon England (especially one who gave military service in exchange for land)	a native or naturalized member of a state or other political community
a feudal lord or baron