thane vs Lord

thane and Lord both are nouns.

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

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

Other hypernyms of thane include noble, nobleman.

thane (noun)	Lord (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 titled peer of the realm
a feudal lord or baron	terms referring to the Judeo-Christian God