トイレtoire

1. nountoilet; restroom; bathroom; lavatory
   トイレの水みずが止とまりません。↗

   The toilet won't stop running.
2. noungoing to the toilet; relieving oneself

• SynonymトイレットNeutralThe source word behind 「トイレ」. Rarely used on its own now; today it mainly appears in compounds like 「トイレットペーパー」.
• Synonymお手洗いおてあらいNeutralThe polite choice, best when asking where it is (「お手洗いはどこですか」). More courteous than 「トイレ」, and both are in common use.
• SynonymラバトリーWrittenA loanword seen mainly on signs for lavatories on planes and trains; rare in everyday conversation, where 「トイレ」 is the usual word.
• Synonym便所べんじょWrittenA blunt word that sounds crude today; you mostly see it in old buildings and old-style public toilets. In everyday speech people say 「トイレ」 instead.
• Related手洗いてあらいNeutralFor the toilet it is softer and more refined than 「トイレ」, but it also means washing one's hands or hand-washing clothes; the toilet sense is usually 「お手洗い」.
• Related便所べんじょWrittenA blunt word that sounds crude today; you mostly see it in old buildings and old-style public toilets. In everyday speech people say 「トイレ」 instead.
• Related不浄ふじょうWrittenBasically means being unclean or impure, and can also refer to excrement or menstruation. As a word for the toilet it sounds archaic; not used in daily speech.
• Relatedご不浄ごふじょうFormalA polite euphemism once used mainly by women; almost never heard today. For everyday politeness, 「お手洗い」 is the word to use.
• Related化粧室けしょうしつFormalAn elegant euphemism, more polite than 「トイレ」; common on signs and in staff language at malls, restaurants and hotels.
• Related不浄場ふじょうばWrittenAn old-fashioned term for toilets and other unclean places; rarely seen today and carries an antique flavor. Say 「トイレ」 in daily life.
• Related厠かわやWrittenAn old name for the toilet, found in classical texts and historical topics; modern novels also use it for an old-time or humorous tone. Not used in daily speech.
• Related後架こうかWrittenOriginally the name for the toilet in Zen temples; essentially unused today. In daily life people say 「トイレ」 or 「お手洗い」.
• Related雪隠せっちんWrittenAn archaic word almost never used in daily speech; today it survives mainly in the shogi term 「雪隠詰め」. Normally say 「トイレ」.

Everyday speech defaults to 「トイレ」; 「お手洗い」 is the polite choice for asking directions, and 「化粧室」 is common on signs at malls, restaurants and hotels. 「便所」 sounds blunt and crude today, while 「厠」 and 「雪隠」 are old names kept for classical or historical flavor. The rest are rare outside set phrases and signs.

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

1. 便所べんじょ。
2. 用便ようべん。