Siamese cat vs house cat

Siamese cat and house cat both are nouns.

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

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

Siamese cat: a slender short-haired blue-eyed breed of cat having a pale coat with dark ears paws face and tail tip
house cat: any domesticated member of the genus Felis

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

Siamese cat (noun)	house cat (noun)
a slender short-haired blue-eyed breed of cat having a pale coat with dark ears paws face and tail tip	any domesticated member of the genus Felis