Shih-Tzu vs toy

Shih-Tzu and toy both are nouns.

Word	Noun	Adjective	Verb	Adverb
Shih-Tzu	Yes	No	No	No
toy	Yes	No	Yes	No

As nouns, toy is a hypernym of Shih-Tzu; that is, toy is a word with a broader meaning than Shih-Tzu:

Other hypernyms of Shih-Tzu include toy dog.

Shih-Tzu (noun)	toy (noun)
a Chinese breed of small dog similar to a Pekingese	any of several breeds of very small dogs kept purely as pets
	an artifact designed to be played with
	a copy that reproduces a person or thing in greatly reduced size
	a nonfunctional replica of something else (frequently used as a modifier)
	a device regarded as providing amusement

Shih-Tzu (verb)	toy (verb)
	engage in an activity as if it were a game rather than take it seriously
	manipulate manually or in one's mind or imagination
	behave carelessly or indifferently