pushing vs pressing

pushing and pressing both are nouns.

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

As nouns, pressing is a hyponym of pushing; that is, pressing is a word with a more specific, narrower meaning than pushing:

Other hyponyms of pushing include depression, jog, nudge, press, pressure, shove, boost.

pushing (noun)	pressing (noun)
the act of applying force in order to move something away	the act of pressing; the exertion of pressure
	a metal or plastic part that is made by a mechanical press

pushing (adjective)	pressing (adjective)
	compelling immediate action