Pomeranian vs spitz

Pomeranian and spitz both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pomeranian	Yes	No	No	No
spitz	Yes	No	No	No

As nouns, spitz is a hypernym of Pomeranian; that is, spitz is a word with a broader meaning than Pomeranian:

Pomeranian: breed of very small compact long-haired dogs of the spitz type
spitz: any of various stocky heavy-coated breeds of dogs native to northern regions having pointed muzzles and erect ears with a curled furry tail

Pomeranian (noun)	spitz (noun)
breed of very small compact long-haired dogs of the spitz type	any of various stocky heavy-coated breeds of dogs native to northern regions having pointed muzzles and erect ears with a curled furry tail