irritability vs surliness

irritability and surliness both are nouns.

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

As nouns, irritability and surliness are synonyms defined as:

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

irritability (noun)	surliness (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