Manx vs house cat

Manx and house cat both are nouns.

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

As nouns, house cat is a hypernym of Manx; that is, house cat is a word with a broader meaning than Manx:

Manx: a short-haired tailless breed of cat believed to originate on the Isle of Man
house cat: any domesticated member of the genus Felis

Other hypernyms of Manx include domestic cat, Felis catus, Felis domesticus.

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

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