transom vs fanlight

transom and fanlight both are nouns.

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

As nouns, transom and fanlight are synonyms defined as:

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

Other synonyms of transom include transom window.

transom (noun)	fanlight (noun)
a horizontal crosspiece across a window or separating a door from a window over it	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 above a door that is usually hinged to a horizontal crosspiece over the door
	a window in a roof to admit daylight