water spaniel vs spaniel

water spaniel and spaniel both are nouns.

Word	Noun	Adjective	Verb	Adverb
water spaniel	Yes	No	No	No
spaniel	Yes	No	No	No

As nouns, spaniel is a hypernym of water spaniel; that is, spaniel is a word with a broader meaning than water spaniel:

water spaniel: any dog of two large curly-coated breeds used for hunting waterfowl
spaniel: any of several breeds of small to medium-sized gun dogs with a long silky coat and long frilled ears

water spaniel (noun)	spaniel (noun)
any dog of two large curly-coated breeds used for hunting waterfowl	any of several breeds of small to medium-sized gun dogs with a long silky coat and long frilled ears