bump vs nubble

bump and nubble both are nouns.

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

As nouns, nubble is a hyponym of bump; that is, nubble is a word with a more specific, narrower meaning than bump:

bump: something that bulges out or is protuberant or projects from its surroundings
nubble: a small lump or protuberance

Other hyponyms of bump include frontal eminence, occipital protuberance, belly, caput, mogul, nub, snag, wart.

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

bump (verb)	nubble (verb)
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