item vs high spot

item and high spot both are nouns.

Word	Noun	Adjective	Verb	Adverb
item	Yes	No	No	Yes
high spot	Yes	No	No	No

As nouns, high spot is a hyponym of item; that is, high spot is a word with a more specific, narrower meaning than item:

Other hyponyms of item include highlight.

item (noun)	high spot (noun)
a whole individual unit; especially when included in a list or collection	the most interesting or memorable part
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

item (adverb)	high spot (adverb)
(used when listing or enumerating items) also