accessory vs accoutrement

accessory and accoutrement both are nouns.

Word	Noun	Adjective	Verb	Adverb
accessory	Yes	Yes	No	No
accoutrement	Yes	No	No	No

As nouns, accessory and accoutrement are synonyms defined as:

accessory and accoutrement: clothing that is worn or carried, but not part of your main clothing

Other synonyms of accessory include accouterment.

accessory (noun)	accoutrement (noun)
a supplementary component that improves capability	clothing that is worn or carried, but not part of your main clothing
clothing that is worn or carried, but not part of your main clothing
someone who helps another person commit a crime

accessory (adjective)	accoutrement (adjective)
furnishing added support
aiding and abetting in a crime