sea-poose vs undercurrent

sea-poose and undercurrent both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea-poose	Yes	No	No	No
undercurrent	Yes	No	No	No

As nouns, undercurrent is a hypernym of sea-poose; that is, undercurrent is a word with a broader meaning than sea-poose:

sea-poose: the seaward undercurrent created after waves have broken on the shore
undercurrent: a current below the surface of a fluid

Other hypernyms of sea-poose include undertide.

sea-poose (noun)	undercurrent (noun)
the seaward undercurrent created after waves have broken on the shore	a subdued emotional quality underlying an utterance; implicit meaning
	a current below the surface of a fluid