lampshade vs lamp shade

lampshade and lamp shade both are nouns.

Word	Noun	Adjective	Verb	Adverb
lampshade	Yes	No	No	No
lamp shade	Yes	No	No	No

As nouns, lampshade and lamp shade are synonyms defined as:

lampshade and lamp shade: a protective ornamental covering for a lamp, used to screen a light bulb from direct view

Other synonyms of lampshade include shade.

lampshade (noun)	lamp shade (noun)
a protective ornamental covering for a lamp, used to screen a light bulb from direct view	a protective ornamental covering for a lamp, used to screen a light bulb from direct view