nook and cranny vs item

nook and cranny and item both are nouns.

Word	Noun	Adjective	Verb	Adverb
nook and cranny	Yes	No	No	No
item	Yes	No	No	Yes

As nouns, item is a hypernym of nook and cranny; that is, item is a word with a broader meaning than nook and cranny:

Other hypernyms of nook and cranny include detail, point.

nook and cranny (noun)	item (noun)
something remote	a whole individual unit; especially when included in a list or collection
	an isolated fact that is considered separately from the whole
	a distinct part that can be specified separately in a group of things that could be enumerated on a list
	an individual instance of a type of symbol
	a small part that can be considered separately from the whole

nook and cranny (adverb)	item (adverb)
	(used when listing or enumerating items) also