lamp shade vs lampshade

lamp shade and lampshade both are nouns.

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

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

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

Other synonyms of lamp shade include shade.

lamp shade (noun)	lampshade (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