shop floor vs workplace

shop floor and workplace both are nouns.

Word	Noun	Adjective	Verb	Adverb
shop floor	Yes	No	No	No
workplace	Yes	No	No	No

As nouns, workplace is a hypernym of shop floor; that is, workplace is a word with a broader meaning than shop floor:

shop floor: workplace consisting of the part of a factory housing the machines
workplace: a place where work is done

Other hypernyms of shop floor include work.

shop floor (noun)	workplace (noun)
workplace consisting of the part of a factory housing the machines	a place where work is done