Translation

sunameri means "Finless Porpoise" in English.

sunameri is normally written with katakana, as スナメリ.
sunameri written with hiragana is すなめり.
sunameri written with kanji is 砂滑.
These are jouyou kanji 常用漢字, taught in junior high, chuugakkou 中学校.
Romaji su na me ri
Hiragana
Katakana
Kanji
Meaning Sand Slippery
School Level 小6

Further Reading

suna-nezumi 砂鼠.