mill vs assembly line

mill and assembly line both are nouns.

Word	Noun	Adjective	Verb	Adverb
mill	Yes	No	Yes	No
assembly line	Yes	No	No	No

mill (noun)	assembly line (noun)
the act of grinding to a powder or dust	mechanical system in a factory whereby an article is conveyed through sites at which successive operations are performed on it
machinery that processes materials by grinding or crushing
a plant consisting of one or more buildings with facilities for manufacturing

mill (verb)	assembly line (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