rear vs prick up

rear is a noun but prick up is not a noun.

Word	Noun	Adjective	Verb	Adverb
rear	Yes	Yes	Yes	No
prick up	No	No	Yes	No

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

Other hyponyms of rear include pitch, set up, cock up, prick.

rear (noun)	prick up (noun)
the side that goes last or is not normally seen
the fleshy part of the human body that you sit on
the back of a military formation or procession
the side of an object that is opposite its front
the part of something that is furthest from the normal viewer

rear (adjective)	prick up (adjective)
located in or toward the back or rear

rear (verb)	prick up (verb)
construct, build, or erect	to stick up
stand up on the hind legs, of quadrupeds
cause to rise up
look after a child until it is an adult
rise up