fanlight vs transom window

fanlight and transom window both are nouns.

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

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

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

Other synonyms of fanlight include transom.

fanlight (noun)	transom window (noun)
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