backlog vs firewood

backlog and firewood both are nouns.

Word	Noun	Adjective	Verb	Adverb
backlog	Yes	No	Yes	No
firewood	Yes	No	No	No

As nouns, firewood is a hypernym of backlog; that is, firewood is a word with a broader meaning than backlog:

backlog (noun)	firewood (noun)
an accumulation of jobs not done or materials not processed that are yet to be dealt with (especially unfilled customer orders for products or services)	wood used for fuel
something kept back or saved for future use or a special purpose
the large log at the back of a hearth fire

backlog (verb)	firewood (verb)
accumulate and create a backlog