ferrule vs collet

ferrule and collet both are nouns.

Word	Noun	Adjective	Verb	Adverb
ferrule	Yes	No	No	No
collet	Yes	No	No	No

As nouns, ferrule and collet are synonyms defined as:

ferrule and collet: a metal cap or band placed on a wooden pole to prevent splitting

ferrule (noun)	collet (noun)
a metal cap or band placed on a wooden pole to prevent splitting	a band or collar that holds an individual stone in a jewelry setting
	a metal cap or band placed on a wooden pole to prevent splitting
	a cone-shaped chuck used for holding cylindrical pieces in a lathe