noun
joined thing; assembled item
Refers to something made by joining parts together, such as a puzzle, a joined piece of wood, or a composite object. Often used in contexts like woodworking, crafts, or puzzles.
この箱は合わせ物で、釘を一本も使っていない。
This box is a joined piece, made without using a single nail.
ジグソーパズルは合わせ物の一種だ。
A jigsaw puzzle is a type of assembled item.
組み立て refers to the act of assembling or the assembled structure, while 合わせ物 emphasizes the result of joining parts together.
Compound of 合わせ (awase, 'joining') + 物 (mono, 'thing'). The exact historical derivation is uncertain, but it follows a common pattern for naming objects by their construction method.