Siamese and Siamese cat

Siamese noun - An inlet with two or more couplings to which a hose can be attached so that fire engines can pump water into the sprinkler system of a building.

Siamese cat and siamese are semantically related. In some cases you can use "Siamese cat" instead a noun "Siamese".

Siamese cat noun - A slender short-haired blue-eyed breed of cat having a pale coat with dark ears paws face and tail tip.

Siamese and Siamese cat are semantically related. You can use "Siamese" instead a noun phrase "Siamese cat".