pet vs crossness

pet and crossness both are nouns.

Word	Noun	Adjective	Verb	Adverb
pet	Yes	Yes	Yes	No
crossness	Yes	No	No	No

As nouns, crossness is a hypernym of pet; that is, crossness is a word with a broader meaning than pet:

pet: a fit of petulance or sulkiness (especially at what is felt to be a slight)
crossness: an irritable petulant feeling

Other hypernyms of pet include choler, fretfulness, fussiness, irritability, peevishness, petulance.

pet (noun)	crossness (noun)
a domesticated animal kept for companionship or amusement	a disposition to be ill-tempered
a fit of petulance or sulkiness (especially at what is felt to be a slight)	an irritable petulant feeling
a special loved one

pet (adjective)	crossness (adjective)
preferred above all others and treated with partiality

pet (verb)	crossness (verb)
stroke or caress gently
stroke or caress in an erotic manner, as during lovemaking