surliness vs irritability

surliness and irritability both are nouns.

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

As nouns, surliness and irritability are synonyms defined as:

Other synonyms of surliness include biliousness, peevishness, pettishness, snappishness, temper.

surliness (noun)	irritability (noun)
a disposition to exhibit uncontrolled anger	a disposition to exhibit uncontrolled anger
	excessive sensitivity of an organ or body part
	an irritable petulant feeling