backlog vs reserve fund

backlog and reserve fund both are nouns.

Word	Noun	Adjective	Verb	Adverb
backlog	Yes	No	Yes	No
reserve fund	Yes	No	No	No

As nouns, reserve fund is a hyponym of backlog; that is, reserve fund is a word with a more specific, narrower meaning than backlog:

backlog: something kept back or saved for future use or a special purpose
reserve fund: funds taken out of earnings to provide for anticipated future payments

Other hyponyms of backlog include bank, fuel level, reserve account, capital reserve.

backlog (noun)	reserve fund (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)	funds taken out of earnings to provide for anticipated future payments
something kept back or saved for future use or a special purpose
the large log at the back of a hearth fire

backlog (verb)	reserve fund (verb)
accumulate and create a backlog