behind vs rump

behind and rump both are nouns.

Word	Noun	Adjective	Verb	Adverb
behind	Yes	Yes	No	Yes
rump	Yes	No	No	No

As nouns, behind and rump are synonyms defined as:

behind (noun)	rump (noun)
the fleshy part of the human body that you sit on	the part of an animal that corresponds to the human buttocks
	the fleshy part of the human body that you sit on
	fleshy hindquarters; behind the loin and above the round

behind (adjective)	rump (adjective)
having the lower score or lagging position in a contest

behind (adverb)	rump (adverb)
in or to or toward the rear
remaining in a place or condition that has been left or departed from
in debt
in or into an inferior position
showing a time that is earlier than the actual time