decrease vs attrition

decrease and attrition both are nouns.

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

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

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

decrease (noun)	attrition (noun)
the act of decreasing or reducing something	the act of rubbing together; wearing something down by friction
the amount by which something decreases	a wearing down to weaken or destroy
a change downward	sorrow for sin arising from fear of damnation
a process of becoming smaller or shorter	the wearing down of rock particles by friction due to water or wind or ice
	erosion by friction

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