hothead vs grouch

hothead and grouch both are nouns.

Word	Noun	Adjective	Verb	Adverb
hothead	Yes	No	No	No
grouch	Yes	No	Yes	No

As nouns, grouch is a hypernym of hothead; that is, grouch is a word with a broader meaning than hothead:

Other hypernyms of hothead include churl, crank, crosspatch, grump.

hothead (noun)	grouch (noun)
a reckless impetuous irresponsible person	a bad-tempered person
a belligerent grouch

hothead (verb)	grouch (verb)
	show one's unhappiness or critical attitude