push up vs uplift

push up is not a noun while uplift is a noun.

Word	Noun	Adjective	Verb	Adverb
push up	No	No	Yes	No
uplift	Yes	No	Yes	No

As verbs, uplift is a hyponym of push up; that is, uplift is a word with a more specific, narrower meaning than push up:

Other hyponyms of push up include boost up, push up.

push up (noun)	uplift (noun)
	a brassiere that lifts and supports the breasts
	(geology) a rise of land to a higher elevation (as in the process of mountain building)

push up (verb)	uplift (verb)
push upward	fill with high spirits; fill with optimism
push from beneath	lift up or elevate
push violently in a specified direction	lift up from the earth, as by geologic forces