toy spaniel vs papillon

toy spaniel and papillon both are nouns.

Word	Noun	Adjective	Verb	Adverb
toy spaniel	Yes	No	No	No
papillon	Yes	No	No	No

As nouns, papillon is a hyponym of toy spaniel; that is, papillon is a word with a more specific, narrower meaning than toy spaniel:

toy spaniel: a very small spaniel
papillon: small slender toy spaniel with erect ears and a black-spotted brown to white coat

Other hyponyms of toy spaniel include English toy spaniel, King Charles spaniel.

toy spaniel (noun)	papillon (noun)
a very small spaniel	small slender toy spaniel with erect ears and a black-spotted brown to white coat