oriel window vs oriel

oriel window and oriel both are nouns.

Word	Noun	Adjective	Verb	Adverb
oriel window	Yes	No	No	No
oriel	Yes	No	No	No

As nouns, oriel window and oriel are synonyms defined as:

oriel window and oriel: a projecting bay window corbeled or cantilevered out from a wall

oriel window (noun)	oriel (noun)
a projecting bay window corbeled or cantilevered out from a wall	a projecting bay window corbeled or cantilevered out from a wall