Commercial document and Purchase order

Commercial document noun - A document of or relating to commerce.

Purchase order and commercial document are semantically related. In some cases you can replace phrase "Purchase order" with "Commercial document", this phrases are similar.

Purchase order noun - A commercial document used to request someone to supply something in return for payment and providing specifications and quantities.

Commercial document and purchase order are semantically related. You can use "Commercial document" instead a noun phrase "Purchase order".