How to say "End" in Japanese

When translating "end" into Japanese, you must choose carefully between 終了 and とことん. In Japanese, 終了 (しゅうりょう (shūryō)) is typically associated with "end; close; completion" (Syllabus Level: N3) and represents Often used for events, meetings, projects, or formal procedures. Can be a noun. On the other hand, とことん (とことん (tokoton)) maps to "to the end, thoroughly, completely, all the way" (Syllabus Level: N1) and represents Implies pursuing something to its absolute limit, without compromise, until nothing more can be done or achieved. Often used with verbs like 調べる. A literal translation of "end" can often sound unnatural to native Japanese speakers if mixed up!