juro

Juro is law as a body of rules and as a subject you can study: internacia juro, studi juron. A single statute is a leĝo. English collapses both into 'law', so this is a distinction the learner has to build rather than translate.

Three neighbouring adjectives, three different meanings. Jura means legal, to do with the law as a field. Justa means fair, and a jura decision can be thoroughly unfair. Leĝa means lawful, in accordance with the statute.

Now the trap. Ĵuri, to swear an oath, looks like the same word with a hat on. In Latin it genuinely is family: iurare, to swear, is built on ius. In Esperanto they are two separate roots, jur- and ĵur-, and the only thing standing between them is the circumflex. Write juri when you mean ĵuri and you have written something that is not a word.