Translation

The Japanese word for "Nightingale" is sayonakidori 小夜鳴き鳥.

Romaji sa yo na ki do ri
Hiraganaさよなきどり
Katakanaサヨナキドリ
Kanji 小 夜 鳴 鳥
Meaning Small Night Singing Bird
School Level 小1 小2 小2 小2

Loan-word

The word "Nightingale" katakanized would be naichingēru ナイチンゲール.
Romaji na i chi n gee ru
Katakanaナイチンゲール
Hiraganaないちんげーる

Synonyms

Scientific name: Luscinia megarhynchos.

Further Reading

Japanese Nightingale.