Translation

kaki means "Oyster" in English.

kaki written with kanji is 牡蠣.
This word contains non-jouyou kanji 常用漢字.
kaki written with katakana is カキ.
kaki written with hiragana is かき.
Romaji ka ki
Hiragana
Katakana
Kanji 牡蠣
School Level ,

kaki may also be written as 牡蛎, or .

Further Reading

Wikipedia: 牡蛎 (Oyster)