amass vs backlog

amass is not a noun while backlog is a noun.

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

As verbs, backlog is a hyponym of amass; that is, backlog is a word with a more specific, narrower meaning than amass:

Other hyponyms of amass include accrete, drift.

amass (noun)	backlog (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)
	something kept back or saved for future use or a special purpose
	the large log at the back of a hearth fire

amass (verb)	backlog (verb)
increase in amount by collecting or gathering	accumulate and create a backlog
get or gather together