fretfulness vs pet

fretfulness and pet both are nouns.

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

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

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

Other hyponyms of fretfulness include testiness, tetchiness, touchiness.

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

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

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