pony vs Welsh pony

pony and Welsh pony both are nouns.

Word	Noun	Adjective	Verb	Adverb
pony	Yes	No	No	No
Welsh pony	Yes	No	No	No

As nouns, Welsh pony is a hyponym of pony; that is, Welsh pony is a word with a more specific, narrower meaning than pony:

pony: any of various breeds of small gentle horses usually less than five feet high at the shoulder
Welsh pony: breed of small ponies originally from Wales

Other hyponyms of pony include Shetland pony, Exmoor.

pony (noun)	Welsh pony (noun)
any of various breeds of small gentle horses usually less than five feet high at the shoulder	breed of small ponies originally from Wales
a range horse of the western United States
an informal term for a racehorse
a small glass adequate to hold a single swallow of whiskey
a literal translation used in studying a foreign language (often used illicitly)