compaction vs mill

compaction and mill both are nouns.

Word	Noun	Adjective	Verb	Adverb
compaction	Yes	No	No	No
mill	Yes	No	Yes	No

As nouns, mill is a hyponym of compaction; that is, mill is a word with a more specific, narrower meaning than compaction:

Other hyponyms of compaction include grind, pulverisation, pulverization.

compaction (noun)	mill (noun)
the act of crushing	the act of grinding to a powder or dust
an increase in the density of something	machinery that processes materials by grinding or crushing
	a plant consisting of one or more buildings with facilities for manufacturing

compaction (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