neap tide vs high tide

neap tide and high tide both are nouns.

Word	Noun	Adjective	Verb	Adverb
neap tide	Yes	No	No	No
high tide	Yes	No	No	No

As nouns, high tide is a hypernym of neap tide; that is, high tide is a word with a broader meaning than neap tide:

neap tide: a less than average tide occurring at the first and third quarters of the moon
high tide: the tide when the water is highest

Other hypernyms of neap tide include high water, highwater.

neap tide (noun)	high tide (noun)
a less than average tide occurring at the first and third quarters of the moon	the tide when the water is highest