fighter vs hell-rooster

fighter and hell-rooster both are nouns.

Word	Noun	Adjective	Verb	Adverb
fighter	Yes	No	No	No
hell-rooster	Yes	No	No	No

As nouns, hell-rooster is a hyponym of fighter; that is, hell-rooster is a word with a more specific, narrower meaning than fighter:

fighter (noun)	hell-rooster (noun)
a high-speed military or naval airplane designed to destroy enemy aircraft in the air	someone who is a very fierce fighter
someone who fights (or is fighting)
someone who fights for a cause