tilter vs challenger

tilter and challenger both are nouns.

Word	Noun	Adjective	Verb	Adverb
tilter	Yes	No	No	No
challenger	Yes	No	No	No

As nouns, challenger is a hypernym of tilter; that is, challenger is a word with a broader meaning than tilter:

Other hypernyms of tilter include competition, competitor, contender, rival.

tilter (noun)	challenger (noun)
a device for emptying a cask by tilting it without disturbing the dregs	the contestant you hope to defeat
someone who engages in a tilt or joust