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すなめり
Katakanaスナメリ
Kanji 砂 滑
Meaning Sand Slippery
School Level 小6 中

Further Reading

suna-nezumi 砂鼠.