grouch vs hothead

grouch and hothead both are nouns.

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

As nouns, hothead is a hyponym of grouch; that is, hothead is a word with a more specific, narrower meaning than grouch:

Other hyponyms of grouch include crab, crabby person, fire-eater, misanthrope, misanthropist.

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

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