sea puss vs undertide

sea puss and undertide both are nouns.

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

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

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

Other hypernyms of sea puss include undercurrent.

sea puss (noun)	undertide (noun)
the seaward undercurrent created after waves have broken on the shore	a current below the surface of a fluid