fussiness vs irritability

fussiness and irritability both are nouns.

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

As nouns, fussiness and irritability are synonyms defined as:

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

fussiness (noun)	irritability (noun)
unnecessary elaborateness in details	a disposition to exhibit uncontrolled anger
an irritable petulant feeling	excessive sensitivity of an organ or body part
	an irritable petulant feeling