Mackinaw coat vs mackinaw

Mackinaw coat and mackinaw both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mackinaw coat	Yes	No	No	No
mackinaw	Yes	No	No	No

As nouns, Mackinaw coat and mackinaw are synonyms defined as:

Mackinaw coat and mackinaw: a short plaid coat made of made of thick woolen material

Mackinaw coat (noun)	mackinaw (noun)
a short plaid coat made of made of thick woolen material	a heavy woolen cloth heavily napped and felted, often with a plaid design
	a flat-bottomed boat used on upper Great Lakes
	a thick plaid blanket formerly used in the northwestern United States
	a short plaid coat made of made of thick woolen material