demote vs bump

demote is not a noun while bump is a noun.

Word	Noun	Adjective	Verb	Adverb
demote	No	No	Yes	No
bump	Yes	No	Yes	No

As verbs, demote and bump are synonyms defined as:

Other synonyms of demote include break, kick downstairs, relegate.

demote (noun)	bump (noun)
	an impact (as from a collision)
	something that bulges out or is protuberant or projects from its surroundings
	a lump on the body caused by a blow

demote (verb)	bump (verb)
assign to a lower position; reduce in rank	knock against with force or violence
	remove or force from a position of dwelling previously occupied
	to play music at loud volume
	to enjoy some music greatly
	dance erotically or dance with the pelvis thrust forward
	come upon, as if by accident; meet with
	assign to a lower position; reduce in rank