adjustment vs adjust

adjustment is a noun but adjust is not a noun.

Word	Noun	Adjective	Verb	Adverb
adjustment	Yes	No	No	No
adjust	No	No	Yes	No

adjustment (noun)	adjust (noun)
the act of making something different (as e.g. the size of a garment)
the act of adjusting something to match a standard
making or becoming suitable; adjusting to circumstances
an amount added or deducted on the basis of qualifying circumstances
the process of adapting to something (such as environmental conditions)

adjustment (verb)	adjust (verb)
	alter or regulate so as to achieve accuracy or conform to a standard
	adapt or conform oneself to new or different conditions
	make correspondent or conformable
	place in a line or arrange so as to be parallel or straight
	decide how much is to be paid on an insurance claim