rip up vs shred

rip up is not a noun while shred is a noun.

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

As verbs, rip up and shred are synonyms defined as:

Other synonyms of rip up include tear up.

rip up (noun)	shred (noun)
	a small piece of cloth
	a tiny or scarcely detectable amount

rip up (verb)	shred (verb)
tear into shreds	tear into shreds