scheme arch vs skeen arch

scheme arch and skeen arch both are nouns.

Word	Noun	Adjective	Verb	Adverb
scheme arch	Yes	No	No	No
skeen arch	Yes	No	No	No

As nouns, scheme arch and skeen arch are synonyms defined as:

scheme arch and skeen arch: an arch whose height is less than half its width

Other synonyms of scheme arch include diminished arch, skene arch.

scheme arch (noun)	skeen arch (noun)
an arch whose height is less than half its width	an arch whose height is less than half its width