accessory vs accouterment

accessory and accouterment both are nouns.

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

As nouns, accessory and accouterment are synonyms defined as:

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

Other synonyms of accessory include accoutrement.

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