ルールruuru

1. nounrule
   このルールはすべての場合ばあいに当あてはまる。↗

   This rule applies to all cases.

• Synonym規則きそくNeutralThe standard word for rules, as in 「学校の規則」; somewhat formal. 「ルール」 is the everyday word, common for games, sports and daily life.
• Synonym規定きていWrittenWritten word for stipulations or provisions, as in 「規定の料金」; mostly in documents. 「ルール」 covers rules in general.
• Synonym規律きりつNeutralDiscipline and order, as in 「規律正しい生活」; stresses keeping to rules. 「ルール」 refers to the individual rules themselves.
• Synonym定めさだめWrittenWritten word for provisions or arrangements, but also fate or destiny, as in 「世の定め」— a sense 「ルール」 lacks.
• Synonym本則ほんそくFormalFormal legal term for the main text of a law or its basic provisions. Rarely used in daily life for ordinary rules.
• Synonym掟おきてNeutralRules a community must observe, as in 「村の掟」; carries a traditional flavour. 「ルール」 sounds modern.
• Synonym決めきめNeutralAgreements or arrangements, mostly in compounds like 「取り決め」. Rarely used alone; in daily speech say 「決まり」.
• Synonym法則ほうそくNeutralUsually laws of nature or inherent regularities, as in 「自然の法則」. Rules made by people are normally 「ルール」.
• Synonym決まりきまりNeutralRules and customs, as in 「家の決まり」; common in speech. Largely interchangeable with 「ルール」.
• Synonym準則じゅんそくWrittenWritten word for standards or guidelines, mostly in laws and regulations. In daily speech say 「ルール」 or 「規則」.
• Synonym定則ていそくWrittenWritten word for established rules; rare. Say 「ルール」 or 「規則」 in everyday contexts.
• Synonym法のりWrittenRead 「のり」; a literary, old-fashioned word for laws or norms, also Buddhist teachings. Say 「ルール」 or 「決まり」 in daily life.
• Related法令ほうれいFormalFormal term for statutes and the ordinances issued under them, as in 「法令遵守」. 「ルール」 means rules in general.
• Related法度はっとNeutralMostly used as 「〜はご法度だ」 to say something is strictly forbidden; also medieval laws and ordinances.
• Related規制きせいNeutralRegulation or control under rules, as in 「規制緩和」. 「ルール」 is the rule itself, not the act of restricting.
• Related原則げんそくNeutralBasic principles or general rules; also an adverb in 「原則として」. 「ルール」 refers to concrete rules.
• Related律りつWrittenWritten word for ancient East Asian penal codes or Buddhist monastic rules, as in 「律令」. Not used for everyday rules.
• Related法式ほうしきWrittenWritten word for the prescribed forms of rites and ceremonies; rare. 「ルール」 covers rules in general.
• Related法のりWrittenRead 「のり」; a literary, old-fashioned word for laws or norms, also Buddhist teachings. Say 「ルール」 or 「決まり」 in daily life.

「ルール」 is the everyday word for rules everyone follows in games, sports and daily life, as in 「ルールを守る」. For the formal term say 「規則」, for written provisions 「規定」, in casual speech 「決まり」, and for laws of nature 「法則」. Others are narrower: 「規律」 is discipline, 「掟」 traditional community rules, 「規制」 regulation or control, 「原則」 basic principles, while 「準則」「定則」「法式」「律」「法」「定め」 are written or literary, and 「本則」「法令」「法度」 legal terms.

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

1. 規則きそく。