reduce vs bump

reduce is not a noun while bump is a noun.

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

As verbs, bump is a hypernym of reduce; that is, bump is a word with a broader meaning than reduce:

Other hypernyms of reduce include break, demote, kick downstairs, relegate.

reduce (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

reduce (verb)	bump (verb)
take off weight	knock against with force or violence
cut down on; make a reduction in	remove or force from a position of dwelling previously occupied
narrow or limit	to play music at loud volume
cook until very little liquid is left	to enjoy some music greatly
to remove oxygen from a compound, or cause to react with hydrogen or form a hydride, or to undergo an increase in the number of electrons	dance erotically or dance with the pelvis thrust forward
make smaller	come upon, as if by accident; meet with
reduce in size; reduce physically	assign to a lower position; reduce in rank
make less complex
reduce in scope while retaining essential elements
lessen the strength or flavor of a solution or mixture
be cooked until very little liquid is left
be the essential element
destress and thus weaken a sound when pronouncing it
undergo meiosis
reposition (a broken bone after surgery) back to its normal site
lower in grade or rank or force somebody into an undignified situation
lessen and make more modest
simplify the form of a mathematical equation of expression by substituting one term for another
bring to humbler or weaker state or condition
put down by force or intimidation