suppress vs suppression

suppress is not a noun while suppression is a noun.

Word	Noun	Adjective	Verb	Adverb
suppress	No	No	Yes	No
suppression	Yes	No	No	No

suppress (noun)	suppression (noun)
	the act of withholding or withdrawing some book or writing from publication or circulation
	forceful prevention; putting down by power or authority
	(psychology) the conscious exclusion of unacceptable thoughts or desires
	the failure to develop some part or organ

suppress (verb)	suppression (verb)
bring under control by force or authority
lessen to the point of stopping
put out of one's consciousness
consciously restrain from showing; of emotions, desires, impulses, or behavior
come down on or keep down by unjust use of one's authority