Related words 白しろ 餡あん White bean paste made from white kidney beans, while uguisu-an is made from green peas and has a distinct greenish-brown color.
こし 餡あん Smooth red bean paste; uguisu-an is a different type of sweet paste with a unique flavor and color.
Written forms うぐいす 餡あん
Standard kanji-kana mixed spelling; the bird name is often written in hiragana.
鶯うぐいす 餡あん
Full kanji spelling; less common but still seen.
ウグイス 餡あん
Katakana spelling for the bird part; sometimes used for emphasis or in product names.
ウグイスあん
Etymology From うぐいす (Japanese bush warbler) + 餡 (sweet bean paste), named for the bird's olive-green color which the paste resembles.
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