withdrawer vs contestant

withdrawer and contestant both are nouns.

Word	Noun	Adjective	Verb	Adverb
withdrawer	Yes	No	No	No
contestant	Yes	No	No	No

As nouns, contestant is a hypernym of withdrawer; that is, contestant is a word with a broader meaning than withdrawer:

withdrawer (noun)	contestant (noun)
a depositor who withdraws funds previously deposited	a person who participates in competitions
a student who withdraws from the educational institution in which he or she was enrolled	a person who dissents from some established policy
a contestant who withdraws from competition
a drug addict who is discontinuing the use of narcotics
an individualist who withdraws from social interaction
an authority who withdraws permission