St Bernard vs Saint Bernard

St Bernard and Saint Bernard both are nouns.

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

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

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

St Bernard (noun)	Saint 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