body servant vs retainer

body servant and retainer both are nouns.

Word	Noun	Adjective	Verb	Adverb
body servant	Yes	No	No	No
retainer	Yes	No	No	No

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

body servant: a valet or personal maid
retainer: a person working in the service of another (especially in the household)

Other hypernyms of body servant include servant.

body servant (noun)	retainer (noun)
a valet or personal maid	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