In lang=en terms the difference between sponge and bum
is that
sponge is to be converted, as dough, into a light, spongy mass by the agency of yeast or leaven while
bum is to make a murmuring or humming sound.
As nouns the difference between sponge and bum
is that
sponge is (countable) any of various marine invertebrates, mostly of the phylum
porifera , that have a porous skeleton often of silica while
bum is the buttocks or
bum can be (north america|colloquial) a hobo; a homeless person, usually a man or
bum can be (dated) a humming noise or
bum can be (obsolete) a bumbailiff.
As verbs the difference between sponge and bum
is that
sponge is (slang) to take advantage of the kindness of others while
bum is (uk|transitive|colloquial) to sodomize; to engage in anal sex or
bum can be (colloquial) to ask someone to give one (something) for free; to beg for something or
bum can be to depress; to make unhappy or
bum can be to make a murmuring or humming sound.
As an interjection bum is
(
label) an expression of annoyance.
As an adjective bum is
of poor quality or highly undesirable .