oriel window vs bay window

oriel window and bay window both are nouns.

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

As nouns, bay window is a hypernym of oriel window; that is, bay window is a word with a broader meaning than oriel window:

oriel window: a projecting bay window corbeled or cantilevered out from a wall
bay window: a window that sticks out from the outside wall of a house

Other hypernyms of oriel window include bow window.

oriel window (noun)	bay window (noun)
a projecting bay window corbeled or cantilevered out from a wall	a window that sticks out from the outside wall of a house
	slang for a paunch