tear vs rip up

tear is a noun but rip up is not a noun.

Word	Noun	Adjective	Verb	Adverb
tear	Yes	No	Yes	No
rip up	No	No	Yes	No

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

Other hyponyms of tear include lacerate, pull, rend, rip, rive, shred, tear up.

tear (noun)	rip up (noun)
a drop of the clear salty saline solution secreted by the lacrimal glands
the act of tearing
an occasion for excessive eating or drinking
an opening made forcibly as by pulling apart

tear (verb)	rip up (verb)
separate or cause to separate abruptly	tear into shreds
to separate or be separated by force
strip of feathers
move quickly and violently
fill with tears or shed tears