undertow vs sea-purse

undertow and sea-purse both are nouns.

Word	Noun	Adjective	Verb	Adverb
undertow	Yes	No	No	No
sea-purse	Yes	No	No	No

As nouns, undertow and sea-purse are synonyms defined as:

undertow and sea-purse: the seaward undercurrent created after waves have broken on the shore

Other synonyms of undertow include sea-poose, sea-puss, sea purse, sea puss.

undertow (noun)	sea-purse (noun)
the seaward undercurrent created after waves have broken on the shore	the seaward undercurrent created after waves have broken on the shore
an inclination contrary to the strongest or prevailing feeling