Mallard and Pheasant

Mallard noun - Wild dabbling duck from which domestic ducks are descended; widely distributed.

Pheasant and mallard are semantically related. In some cases you can use "Pheasant" instead a noun "Mallard".

Pheasant noun - Large long-tailed gallinaceous bird native to the Old World but introduced elsewhere.

Mallard and pheasant are semantically related. You can use "Mallard" instead a noun "Pheasant".