憲章|けんしょうkenshou[0]heiban (flat)

1. nouncharter
   首相しゅしょうは憲章けんしょうに署名しょめいした。↗

   The Premier subscribed his name to the charter.

No synonyms are listed, so there is no choice to make: use 憲章 for a charter, i.e. a formal written document setting out the fundamental principles of a nation, organization, or group.

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

1. 重要じゅうようで根本的こんぽんてきな原則げんそくについて定さだめた取り決とりきめ。
2. 憲法けんぽうの規則きそく。