nuisance vs irritant

nuisance and irritant both are nouns.

Word	Noun	Adjective	Verb	Adverb
nuisance	Yes	No	No	No
irritant	Yes	No	No	No

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

Other hyponyms of nuisance include nuisance, thorn, plague.

nuisance (noun)	irritant (noun)
(law) a broad legal concept including anything that disturbs the reasonable use of your property or endangers life and health or is offensive	something that causes irritation and annoyance
something or someone that causes trouble; a source of unhappiness