skene arch vs diminished arch

skene arch and diminished arch both are nouns.

Word	Noun	Adjective	Verb	Adverb
skene arch	Yes	No	No	No
diminished arch	Yes	No	No	No

As nouns, skene arch and diminished arch are synonyms defined as:

skene arch and diminished arch: an arch whose height is less than half its width

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

skene arch (noun)	diminished arch (noun)
an arch whose height is less than half its width	an arch whose height is less than half its width