variation in textual representation (i.e. spelling)

an ice age (period of glaciation at the poles)

drift ice

delegation (a group of delegates)

(of characters) representing sound; phonetic

(sumo) dohyo-iri, a ring-entering ceremony performed by rikishi in the higher divisions

Kanji characters outside of the jōyō kanji and jinmeiyō kanji lists. For example, 攪.

council

(neologism, slang) fan who expresses vocal support for one's idol but makes no expenditure for them

(Internet slang) kana initials