Jam-packed and Packed to the gunwales

Jam-packed adjective - Containing or seeming to contain the greatest quantity or number possible.

Packed to the gunwales and jam-packed are semantically related. In some cases you can use "Packed to the gunwales" instead an adjective phrase "Jam-packed".

Jam-packed and packed to the gunwales are semantically related. You can use "Jam-packed" instead an adjective phrase "Packed to the gunwales".