finished product; final product
Refers to a completed item, often in manufacturing, project deliverables, or creative works.
Please check the quality of the finished product.
This final product is scheduled for delivery next month.
成果物 refers to deliverables or outcomes of work, often used in project contexts, whereas 完成物 focuses on the finished item itself.
Compound of 完成 (completion) and 物 (thing).