Portland and Portland cement

Portland noun - Freshwater port and largest city in Oregon; located in northwestern Oregon on the Willamette River which divides the city into east and west sections; renowned for its beautiful natural setting among the mountains.

Portland cement and Portland are semantically related. In some cases you can use "Portland cement" instead a noun "Portland".

Portland cement noun - A cement that hardens under water; made by heating limestone and clay in a kiln and pulverizing the result.

Portland and Portland cement are semantically related. You can use "Portland" instead a noun phrase "Portland cement".