tail end vs bum

tail end and bum both are nouns.

Word	Noun	Adjective	Verb	Adverb
tail end	Yes	No	No	No
bum	Yes	Yes	Yes	No

As nouns, tail end and bum are synonyms defined as:

tail end (noun)	bum (noun)
the fleshy part of the human body that you sit on	the fleshy part of the human body that you sit on
any projection that resembles the tail of an animal	a vagrant
the time of the last part of something	a person who is deemed to be despicable or contemptible
	person who does no work

tail end (adjective)	bum (adjective)
	of very poor quality; flimsy

tail end (verb)	bum (verb)
	ask for and get free; be a parasite
	be lazy or idle