attrition vs decrease

attrition and decrease both are nouns.

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

As nouns, decrease is a hypernym of attrition; that is, decrease is a word with a broader meaning than attrition:

Other hypernyms of attrition include drop-off, lessening.

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

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