auto accessory vs supplement

auto accessory and supplement both are nouns.

Word	Noun	Adjective	Verb	Adverb
auto accessory	Yes	No	No	No
supplement	Yes	No	Yes	No

As nouns, supplement is a hypernym of auto accessory; that is, supplement is a word with a broader meaning than auto accessory:

Other hypernyms of auto accessory include accessory, add-on, appurtenance.

auto accessory (noun)	supplement (noun)
an accessory for an automobile	a supplementary component that improves capability
	a quantity added (e.g. to make up for a deficiency)
	textual matter that is added onto a publication; usually at the end

auto accessory (verb)	supplement (verb)
	add to the very end
	add as a supplement to what seems insufficient
	serve as a supplement to