resentment vs sulkiness

resentment and sulkiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
resentment	Yes	No	No	No
sulkiness	Yes	No	No	No

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

Other hyponyms of resentment include heartburning, huffishness, grievance, grudge, score, enviousness, envy.

resentment (noun)	sulkiness (noun)
a feeling of deep and bitter anger and ill-will	a sullen moody resentful disposition
	a feeling of sulky resentment
	a mood or display of sullen aloofness or withdrawal