high tide vs springtide

high tide and springtide both are nouns.

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

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

high tide: the tide when the water is highest
springtide: a greater than average tide occurring during the new and full moons

Other hyponyms of high tide include direct tide, neap, neap tide.

high tide (noun)	springtide (noun)
the tide when the water is highest	a greater than average tide occurring during the new and full moons
	a swelling rush of anything