key fob vs accouterment

key fob and accouterment both are nouns.

Word	Noun	Adjective	Verb	Adverb
key fob	Yes	No	No	No
accouterment	Yes	No	No	No

As nouns, accouterment is a hypernym of key fob; that is, accouterment is a word with a broader meaning than key fob:

key fob: A small object fastened to a key chain or key ring and designed to be comfortably grasped.
accouterment: clothing that is worn or carried, but not part of your main clothing

Other hypernyms of key fob include accessory, accoutrement.

key fob (noun)	accouterment (noun)
A small object fastened to a key chain or key ring and designed to be comfortably grasped.	clothing that is worn or carried, but not part of your main clothing