What? What did you say?

(archaic) sea urchin

(dialectal) Nonstandard form of 甲蠃 (kase, “sea urchin”) above.

Nothing

what / that thing (used in place of words you can't remember at the moment.)

What?, Huh?

long-spined sea urchin (Diadema setosum)

Nonstandard form of 栄螺 (sazae /さざえ/) above.

a turban shell, especially one of the horned turbans (Turbo cornutus, Turbo sazae) / a tea ceremony utensil: one of the seven rests for the lid of a teakettle, shaped like a turban shell

Nonstandard form of 栄螺 (sazae /さざえ/) above. / Short for 栄螺堂 (sazaidō /さざいどう/).