flour mill vs milling machinery

flour mill and milling machinery both are nouns.

Word	Noun	Adjective	Verb	Adverb
flour mill	Yes	No	No	No
milling machinery	Yes	No	No	No

As nouns, milling machinery is a hypernym of flour mill; that is, milling machinery is a word with a broader meaning than flour mill:

flour mill: a mill for grinding grain into flour
milling machinery: machinery that processes materials by grinding or crushing

Other hypernyms of flour mill include grinder, mill.

flour mill (noun)	milling machinery (noun)
a mill for grinding grain into flour	machinery that processes materials by grinding or crushing