manservant vs butler

manservant and butler both are nouns.

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

As nouns, butler is a hyponym of manservant; that is, butler is a word with a more specific, narrower meaning than manservant:

manservant: a man servant
butler: a manservant (usually the head servant of a household) who has charge of wines and the table

Other hyponyms of manservant include pantryman, footman, gentleman's gentleman, gentleman, man, valet, valet de chambre.

manservant (noun)	butler (noun)
a man servant	a manservant (usually the head servant of a household) who has charge of wines and the table