highlighter vs cosmetic

highlighter and cosmetic both are nouns.

Word	Noun	Adjective	Verb	Adverb
highlighter	Yes	No	No	No
cosmetic	Yes	Yes	No	No

As nouns, cosmetic is a hypernym of highlighter; that is, cosmetic is a word with a broader meaning than highlighter:

highlighter (noun)	cosmetic (noun)
a fluorescent marker used to mark important passages in a text	a toiletry designed to beautify the body
a cosmetic used to highlight the eyes or cheekbones

highlighter (adjective)	cosmetic (adjective)
	serving an aesthetic purpose in beautifying the body
	serving an esthetic rather than a useful purpose