柱

Rare term

mochi added to rice gruel (15th of the first month)

Word usually written using kana alone

icicle

ひょうちゅう only

ice pillar (for cooling a room)

つらら only; Archaic

ice

Ama no Mihashira; the heavenly pillar on Onokoro Island, around which Izanagi and Izanami are said to have wed