We don't have synonyms for sea purses yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are sea purse, sea puss and sea-purse.
(n) :
Alternative form of sea-purse. [The egg case of skate, shark or ratfish; a mermaid's purse.]
(n) :
Alternative form of sea puss. [A strong seaward current; a riptide or undertow, especially as results when a sandbar formed by waves suddenly gives way, and which is dangerous to swimmers.]
(n) :
Alternative form of sea-purse. [The egg case of skate, shark or ratfish; a mermaid's purse.]
(n) :
Alternative form of sea puss. [A strong seaward current; a riptide or undertow, especially as results when a sandbar formed by waves suddenly gives way, and which is dangerous to swimmers.]