decrease vs dwindling

decrease and dwindling both are nouns.

Word	Noun	Adjective	Verb	Adverb
decrease	Yes	No	Yes	No
dwindling	Yes	Yes	No	No

As nouns, dwindling is a hyponym of decrease; that is, dwindling is a word with a more specific, narrower meaning than decrease:

Other hyponyms of decrease include shrinkage, shrinking, casualty, sinking, attrition, rarefaction, dwindling away, waning.

decrease (noun)	dwindling (noun)
the act of decreasing or reducing something	a becoming gradually less
the amount by which something decreases
a change downward
a process of becoming smaller or shorter

decrease (adjective)	dwindling (adjective)
	gradually decreasing until little remains

decrease (verb)	dwindling (verb)
decrease in size, extent, or range
make become smaller