Saint Vitus dance vs St. Vitus dance

Saint Vitus dance and St. Vitus dance both are nouns.

Word	Noun	Adjective	Verb	Adverb
Saint Vitus dance	Yes	No	No	No
St. Vitus dance	Yes	No	No	No

As nouns, Saint Vitus dance and St. Vitus dance are synonyms defined as:

Saint Vitus dance and St. Vitus dance: chorea occurring chiefly in children and associated with rheumatic fever

Other synonyms of Saint Vitus dance include Sydenham's chorea.

Saint Vitus dance (noun)	St. Vitus dance (noun)
chorea occurring chiefly in children and associated with rheumatic fever	chorea occurring chiefly in children and associated with rheumatic fever