transom window vs fanlight

transom window and fanlight both are nouns.

Word	Noun	Adjective	Verb	Adverb
transom window	Yes	No	No	No
fanlight	Yes	No	No	No

As nouns, transom window and fanlight are synonyms defined as:

transom window and fanlight: a window above a door that is usually hinged to a horizontal crosspiece over the door

Other synonyms of transom window include transom.

transom window (noun)	fanlight (noun)
a window above a door that is usually hinged to a horizontal crosspiece over the door	a semicircular window over a door or window; usually has sash bars like the ribs of a fan
	a window above a door that is usually hinged to a horizontal crosspiece over the door
	a window in a roof to admit daylight