Saint Bernard vs St Bernard

Saint Bernard and St Bernard both are nouns.

Word	Noun	Adjective	Verb	Adverb
Saint Bernard	Yes	No	No	No
St Bernard	Yes	No	No	No

As nouns, Saint Bernard and St Bernard are synonyms defined as:

Saint Bernard and St Bernard: a Swiss alpine breed of large powerful dog with a thick coat of hair used as a rescue dog

Saint Bernard (noun)	St Bernard (noun)
a Swiss alpine breed of large powerful dog with a thick coat of hair used as a rescue dog	a Swiss alpine breed of large powerful dog with a thick coat of hair used as a rescue dog