Mallard and Partridge

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

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

Partridge noun - Heavy-bodied small-winged South American game bird resembling a gallinaceous bird but related to the ratite birds.

Mallard and partridge are semantically related. You can use "Mallard" instead a noun "Partridge".