four-centered arch vs Tudor arch

four-centered arch and Tudor arch both are nouns.

Word	Noun	Adjective	Verb	Adverb
four-centered arch	Yes	No	No	No
Tudor arch	Yes	No	No	No

As nouns, four-centered arch and Tudor arch are synonyms defined as:

four-centered arch and Tudor arch: a low elliptical or pointed arch; usually drawn from four centers

four-centered arch (noun)	Tudor arch (noun)
a low elliptical or pointed arch; usually drawn from four centers	a low elliptical or pointed arch; usually drawn from four centers