bobbin vs winder

bobbin and winder both are nouns.

Word	Noun	Adjective	Verb	Adverb
bobbin	Yes	No	No	No
winder	Yes	No	No	No

As nouns, winder is a hypernym of bobbin; that is, winder is a word with a broader meaning than bobbin:

bobbin: a winder around which thread or tape or film or other flexible materials can be wound
winder: mechanical device around which something can be wound

bobbin (noun)	winder (noun)
a winder around which thread or tape or film or other flexible materials can be wound	mechanical device around which something can be wound
	mechanical device used to wind another device that is driven by a spring (as a clock)
	a worker who winds (e.g., a winch or clock or other mechanism)