Master and servant (5)
I believe the answer is:
liege
I believe this is a double definition.
'master' is the first definition.
(thesaurus)
'servant' is the second definition.
(thesaurus)
'and' acts as a link.
(Other definitions for liege that I've seen before include "Belgian, French-speaking city" , "Belgian city or feudal superior" , "Vassal; city in Belgium" , "World War one battle site" , "Owing feudal allegiance" .)