wastrel

In dated|lang=en terms the difference between bum and wastrel

is that bum is (dated) a humming noise while wastrel is (dated) one who is profligate, who wastes time or resources extravagantly.

As nouns the difference between bum and wastrel

is that 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 while wastrel is (dated) one who is profligate, who wastes time or resources extravagantly.

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 (label) an expression of annoyance.

As an adjective bum

is of poor quality or highly undesirable .

Splurger is a synonym of wastrel.

As nouns the difference between wastrel and splurger

is that wastrel is one who is profligate, who wastes time or resources extravagantly while splurger is one who splurges.