trunk vs rear end

trunk and rear end both are nouns.

Word	Noun	Adjective	Verb	Adverb
trunk	Yes	No	No	No
rear end	Yes	No	No	No

trunk (noun)	rear end (noun)
a long flexible snout as of an elephant	the fleshy part of the human body that you sit on
luggage consisting of a large strong case used when traveling or for storage
compartment in an automobile that carries luggage or shopping or tools
the body excluding the head and neck and limbs
the main stem of a tree; usually covered with bark; the bole is usually the part that is commercially useful for lumber