decompression vs decompress

decompression is a noun but decompress is not a noun.

Word	Noun	Adjective	Verb	Adverb
decompression	Yes	No	No	No
decompress	No	No	Yes	No

decompression (noun)	decompress (noun)
relieving pressure (especially bringing a compressed person gradually back to atmospheric pressure)
restoring compressed information to its normal form for use or display

decompression (verb)	decompress (verb)
	become less tense, rest, or take one's ease
	decrease the pressure of
	restore to its uncompressed form