threader vs bodkin

threader and bodkin both are nouns.

Word	Noun	Adjective	Verb	Adverb
threader	Yes	No	No	No
bodkin	Yes	No	No	No

As nouns, threader and bodkin are synonyms defined as:

threader (noun)	bodkin (noun)
a blunt needle for threading ribbon through loops	a blunt needle for threading ribbon through loops
	a small sharp-pointed tool for punching holes in leather or fabric
	formerly a long hairpin; usually with an ornamental head
	a dagger with a slender blade