tank furnace vs furnace

tank furnace and furnace both are nouns.

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

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

tank furnace: furnace into one end of which a batch of measured raw materials is shoveled and from the other end molten glass is obtained
furnace: an enclosed chamber in which heat is produced to heat buildings, destroy refuse, smelt or refine ores, etc.

tank furnace (noun)	furnace (noun)
furnace into one end of which a batch of measured raw materials is shoveled and from the other end molten glass is obtained	an enclosed chamber in which heat is produced to heat buildings, destroy refuse, smelt or refine ores, etc.