傘|かさkasa[1]atamadaka (head-high)

1. nounumbrella; parasol
   タクシーに傘かさを忘わすれてしまった。↗

   I left my umbrella in the cab.
2. nounsomething shaped like an umbrella or a conical hat; shade (of a lamp); mushroom cap; pileus

• Synonym雨傘あまがさNeutralRefers specifically to an umbrella for rain, in contrast with the sun parasol 「日傘」; 「傘」 covers both rain and sun.
• SynonymアンブレラNeutralA loanword, usually for a Western-style umbrella; common in product names and set phrases like 「アンブレラ条項」. In everyday speech people just say 「傘」.
• Related笠かさNeutralA conical hat worn directly on the head, with no handle; 「傘」 is held in the hand.

For an umbrella, 「傘」 is the default word. Use 「雨傘」 when you want to stress protection from rain, and 「笠」 for a conical hat worn on the head. 「アンブレラ」 appears mainly in product names and set phrases.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. （かさ）日光にっこう、雨雪うせつなどを防ふせぐために柄がらの部分ぶぶんを持もって広ひろげ頭上ずじょうに差さしかざすもの。
2. 傘かさ。