Manx cat vs Manx

Manx cat and Manx both are nouns.

Word	Noun	Adjective	Verb	Adverb
Manx cat	Yes	No	No	No
Manx	Yes	Yes	No	No

As nouns, Manx cat and Manx are synonyms defined as:

Manx cat and Manx: a short-haired tailless breed of cat believed to originate on the Isle of Man

Manx cat (noun)	Manx (noun)
a short-haired tailless breed of cat believed to originate on the Isle of Man	a short-haired tailless breed of cat believed to originate on the Isle of Man
	the ancient Gaelic formerly spoken on the Isle of Man; the language is sometimes used on ceremonial occasions

Manx cat (adjective)	Manx (adjective)
	of or relating to the Isle of Man or its inhabitants or their language