athanor vs furnace

athanor and furnace both are nouns.

Word	Noun	Adjective	Verb	Adverb
athanor	Yes	No	No	No
furnace	Yes	No	No	No

As nouns, furnace is a hypernym of athanor; that is, furnace is a word with a broader meaning than athanor:

athanor: a furnace that feeds itself so as to maintain a uniform temperature; used by alchemists
furnace: an enclosed chamber in which heat is produced to heat buildings, destroy refuse, smelt or refine ores, etc.

athanor (noun)	furnace (noun)
a furnace that feeds itself so as to maintain a uniform temperature; used by alchemists	an enclosed chamber in which heat is produced to heat buildings, destroy refuse, smelt or refine ores, etc.