rearing vs rampant

rearing is a noun but rampant is not a noun.

Word	Noun	Adjective	Verb	Adverb
rearing	Yes	Yes	No	No
rampant	No	Yes	No	No

As adjectives, rearing and rampant are synonyms defined as:

rearing and rampant: rearing on left hind leg with forelegs elevated and head usually in profile

rearing (noun)	rampant (noun)
helping someone grow up to be an accepted member of the community
the properties acquired as a consequence of the way you were treated as a child

rearing (adjective)	rampant (adjective)
rearing on left hind leg with forelegs elevated and head usually in profile	(of a plant) having a lush and unchecked growth
	rearing on left hind leg with forelegs elevated and head usually in profile
	unrestrained and violent