sea puss vs undercurrent

sea puss and undercurrent both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea puss	Yes	No	No	No
undercurrent	Yes	No	No	No

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

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

Other hypernyms of sea puss include undertide.

sea puss (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