manservant vs retainer

manservant and retainer both are nouns.

Word	Noun	Adjective	Verb	Adverb
manservant	Yes	No	No	No
retainer	Yes	No	No	No

As nouns, retainer is a hypernym of manservant; that is, retainer is a word with a broader meaning than manservant:

manservant: a man servant
retainer: a person working in the service of another (especially in the household)

Other hypernyms of manservant include servant.

manservant (noun)	retainer (noun)
a man servant	a dental appliance that holds teeth (or a prosthesis) in position after orthodontic treatment
	a person working in the service of another (especially in the household)
	a fee charged in advance to retain the services of someone