juĝejo

Decode it and you get it free. -ej- is the place suffix, and it is one of the highest-yield affixes in the language: lernejo a school from lerni, preĝejo a church from preĝi, kuirejo a kitchen from kuiri, banejo a bathroom from bani. So juĝi plus -ej- is the judging-place, and a learner who knows both halves has never needed to be taught this word. That is the whole argument for Esperanto's word-formation system in one entry, and the affixes article has the rest of the family.

Where tribunalo stops and juĝejo starts. Tribunalo, at rank 2,032, is the institution: the court as a body with authority, the bench, the thing you can be summoned before. Juĝejo is the building: bricks, doors, a public gallery. So la tribunalo decidis (the court ruled) but ni renkontiĝis antaŭ la juĝejo (we met outside the courthouse). English blurs the two under one word and lets context sort it out; Esperanto makes you choose, and the choice is usually easy - if it could have a roof leak, it is a juĝejo.

The rest of the family. Juĝisto is a judge (the person, -ist-), juĝo is a judgement, and juĝado is the process of trying a case. Proceso is the lawsuit itself.