Partridge vs. Grouse: What's the Difference?

Partridge and Grouse Definitions
Partridge
Any of various plump-bodied game birds of several genera in the family Phasianidae, native to Eurasia and Africa and introduced elsewhere.
Grouse
Any of various plump, chiefly ground-dwelling gallinaceous birds of the subfamily Tetraoninae of northern North America and Eurasia, characteristically having feathered legs and nostrils and mottled plumage.
Partridge
Any of several game birds, such as the ruffed grouse or the bobwhite, similar to a partridge.
Grouse
A cause for complaint.
Partridge
(ornithology) Any bird of a number of genera in the family Phasianidae, notably in the genera Perdix and Alectoris.
On the first day of Christmas, my true love sent to me a partridge in a pear tree.
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Grouse
To complain; grumble.
Partridge
A type of cannon charge composed of several missiles fired all together, similar to langrage or case-shot. Also a large cannon that shoots stones.
Grouse
(countable) Any of various game birds of the subfamily Tetraoninae which inhabit temperate and subarctic regions of the Northern Hemisphere; specifically, the red grouse (Lagopus lagopus scotica) native to heather moorland on the British Isles.
Partridge
Any one of numerous species of small gallinaceous birds of the genus Perdix and several related genera of the family Perdicidæ, of the Old World. The partridge is noted as a game bird.
Full many a fat partrich had he in mew.
Grouse
(uncountable) The flesh or meat of this bird eaten as food.
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Partridge
Any one of several species of quail-like birds belonging to Colinus, and allied genera.
Grouse
(informal) A cause for complaint; a grumble.
Partridge
The ruffed grouse (Bonasa umbellus).
Grouse
(intransitive) To hunt or shoot grouse.
Partridge
Flesh of either quail or grouse
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Grouse
To complain or grumble.
Partridge
Heavy-bodied small-winged South American game bird resembling a gallinaceous bird but related to the ratite birds
Grouse
Excellent.
I had a grouse day.
That food was grouse.
Partridge
Small Old World gallinaceous game birds
Grouse
Any of the numerous species of gallinaceous birds of the family Tetraonidæ, and subfamily Tetraoninæ, inhabiting Europe, Asia, and North America. They have plump bodies, strong, well-feathered legs, and usually mottled plumage. The group includes the ptarmigans (Lagopus), having feathered feet.
Partridge
A popular North American game bird; named for its call
Grouse
To seek or shoot grouse.
Partridge
Valued as a game bird in eastern United States and Canada
Grouse
To complain or grumble; as, employees grousing about their incompetent boss.
Grouse
Flesh of any of various grouse of the family Tetraonidae; usually roasted; flesh too dry to broil
Grouse
Popular game bird having a plump body and feathered legs and feet
Grouse
Hunt grouse
Grouse
Complain;
What was he hollering about?