compression vs pressing

compression and pressing both are nouns.

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

As nouns, pressing is a hypernym of compression; that is, pressing is a word with a broader meaning than compression:

Other hypernyms of compression include press, pressure.

compression (noun)	pressing (noun)
applying pressure	the act of pressing; the exertion of pressure
encoding information while reducing the bandwidth or bits required	a metal or plastic part that is made by a mechanical press
the process or result of becoming smaller or pressed together
an increase in the density of something

compression (adjective)	pressing (adjective)
	compelling immediate action