fretfulness vs fussiness

fretfulness and fussiness both are nouns.

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

As nouns, fretfulness and fussiness are synonyms defined as:

Other synonyms of fretfulness include choler, crossness, irritability, peevishness, petulance.

fretfulness (noun)	fussiness (noun)
an irritable petulant feeling	unnecessary elaborateness in details
	an irritable petulant feeling