irritable vs cranky

irritable and cranky both are adjectives.

Word	Noun	Adjective	Verb	Adverb
irritable	No	Yes	No	No
cranky	No	Yes	No	No

As adjectives, irritable and cranky are synonyms defined as:

Other synonyms of irritable include fractious, nettlesome, peckish, peevish, pettish, petulant, scratchy, techy, testy, tetchy.

irritable (adjective)	cranky (adjective)
easily irritated or annoyed	easily irritated or annoyed
capable of responding to stimuli	(used of boats) inclined to heel over easily under sail
abnormally sensitive to a stimulus