coffee grinder vs mill

coffee grinder and mill both are nouns.

Word	Noun	Adjective	Verb	Adverb
coffee grinder	Yes	No	No	No
mill	Yes	No	Yes	No

As nouns, mill is a hypernym of coffee grinder; that is, mill is a word with a broader meaning than coffee grinder:

Other hypernyms of coffee grinder include grinder, milling machinery.

coffee grinder (noun)	mill (noun)
a mill that grinds roasted coffee beans	the act of grinding to a powder or dust
	machinery that processes materials by grinding or crushing
	a plant consisting of one or more buildings with facilities for manufacturing

coffee grinder (verb)	mill (verb)
	grind with a mill
	produce a ridge around the edge of
	roll out (metal) with a rolling machine
	move about in a confused manner