skeen arch vs scheme arch

skeen arch and scheme arch both are nouns.

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

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

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

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

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