tear vs rend

tear is a noun but rend is not a noun.

Word	Noun	Adjective	Verb	Adverb
tear	Yes	No	Yes	No
rend	No	No	Yes	No

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

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

tear (noun)	rend (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)	rend (verb)
separate or cause to separate abruptly	tear or be torn violently
to separate or be separated by force
strip of feathers
move quickly and violently
fill with tears or shed tears