ornamental vs cosmetic

ornamental and cosmetic both are nouns.

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

As adjectives, ornamental and cosmetic are synonyms defined as:

ornamental and cosmetic: serving an esthetic rather than a useful purpose

Other synonyms of ornamental include decorative.

ornamental (noun)	cosmetic (noun)
any plant grown for its beauty or ornamental value	a toiletry designed to beautify the body

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