oppress vs oppression

oppress is not a noun while oppression is a noun.

Word	Noun	Adjective	Verb	Adverb
oppress	No	No	Yes	No
oppression	Yes	No	No	No

oppress (noun)	oppression (noun)
	the act of subjugating by cruelty
	a feeling of being oppressed
	the state of being kept down by unjust use of force or authority:

oppress (verb)	oppression (verb)
come down on or keep down by unjust use of one's authority
cause to suffer