shire vs shire horse

shire and shire horse both are nouns.

Word	Noun	Adjective	Verb	Adverb
shire	Yes	No	No	No
shire horse	Yes	No	No	No

As nouns, shire and shire horse are synonyms defined as:

shire (noun)	shire horse (noun)
British breed of large heavy draft horse	British breed of large heavy draft horse
a former administrative district of England; equivalent to a county