How to say "Completion" in Japanese

When translating "completion" into Japanese, you must choose carefully between 落成 and 完遂. In Japanese, 落成 (らくせい (rakusei)) is typically associated with "completion (of a building, often with a ceremony)" (Syllabus Level: N2) and represents Similar to 竣工, but often implies not just the physical completion of construction, but also the readiness for use and sometimes includes an inauguration or completion ceremony.. On the other hand, 完遂 (かんすい (kansui)) maps to "completion, accomplishment, achievement (of a task, duty, etc.)" (Syllabus Level: N1) and represents Implies successfully finishing a task or goal, often one that was difficult or required persistence. It has a nuance of completing something to the very end. 困難な目標や任務を最後までやり遂げること、達成することを指します。強い意志や努力が伴うニュアンスがあります。. A literal translation of "completion" can often sound unnatural to native Japanese speakers if mixed up!