Translation

uguisu means "Japanese Bush Warbler" in English.

uguisu written with kanji is 鶯.
This word contains non-jouyou kanji 常用漢字.
uguisu written with katakana is ウグイス.
uguisu written with hiragana is うぐいす.
Romaji u gu i su
Hiraganaうぐいす
Katakanaウグイス
Kanji 鶯
School Level ✕

uguisu may also be written as 鴬.

Further Reading

Wikipedia: 鶯 (Japanese_bush_warbler)