pane of glass vs window glass

pane of glass and window glass both are nouns.

Word	Noun	Adjective	Verb	Adverb
pane of glass	Yes	No	No	No
window glass	Yes	No	No	No

As nouns, pane of glass and window glass are synonyms defined as:

pane of glass and window glass: sheet glass cut in shapes for windows or doors

Other synonyms of pane of glass include pane.

pane of glass (noun)	window glass (noun)
sheet glass cut in shapes for windows or doors	sheet glass cut in shapes for windows or doors