compression vs decompression

compression and decompression both are nouns.

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

compression (noun)	decompression (noun)
applying pressure	relieving pressure (especially bringing a compressed person gradually back to atmospheric pressure)
encoding information while reducing the bandwidth or bits required	restoring compressed information to its normal form for use or display
the process or result of becoming smaller or pressed together
an increase in the density of something