As a proper noun law
is or law
can be , perhaps originally meaning someone who lives near a burial mound or law
can be (judaism) the torah.
As a noun 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 a verb 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
) an expression of annoyance.
As an adjective bum is
of poor quality or highly undesirable .