gather vs amass

gather is a noun but amass is not a noun.

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

As verbs, gather and amass are synonyms defined as:

Other synonyms of gather include accumulate, conglomerate, cumulate, pile up.

gather (noun)	amass (noun)
the act of gathering something
sewing consisting of small folds or puckers made by pulling tight a thread in a line of stitching

gather (verb)	amass (verb)
increase in amount by collecting or gathering	increase in amount by collecting or gathering
increase or develop	get or gather together
conclude from evidence
assemble or get together
draw together into folds or puckers
look for (food) in nature
draw and bring closer
collect in one place
get people together