central vs workplace

central and workplace both are nouns.

Word	Noun	Adjective	Verb	Adverb
central	Yes	Yes	No	No
workplace	Yes	No	No	No

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

central: a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication
workplace: a place where work is done

Other hypernyms of central include work.

central (noun)	workplace (noun)
a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication	a place where work is done

central (adjective)	workplace (adjective)
in or near a center or constituting a center; the inner area
serving as an essential component