challenge vs appeal

challenge and appeal both are nouns.

Word	Noun	Adjective	Verb	Adverb
challenge	Yes	No	Yes	No
appeal	Yes	No	Yes	No

As verbs, appeal is a hyponym of challenge; that is, appeal is a word with a more specific, narrower meaning than challenge:

As verbs, appeal is a hyponym of challenge; that is, appeal is a word with a more specific, narrower meaning than challenge:

challenge (noun)	appeal (noun)
a call to engage in a contest or fight	(law) a legal proceeding in which the appellant resorts to a higher court for the purpose of obtaining a review of a lower court decision and a reversal of the lower court's judgment or the granting of a new trial
questioning a statement and demanding an explanation	attractiveness that interests or pleases or stimulates
a formal objection to the selection of a particular person as a juror	earnest or urgent request
a demand by a sentry for a password or identification	request for a sum of money
a demanding or stimulating situation

challenge (verb)	appeal (verb)
issue a challenge to	request earnestly (something from somebody); ask for aid or protection
take exception to	cite as an authority; resort to
raise a formal objection in a court of law	be attractive to
ask for identification	take a court case to a higher court for review
	challenge (a decision)