emcee vs ringmaster

emcee and ringmaster both are nouns.

Word	Noun	Adjective	Verb	Adverb
emcee	Yes	No	Yes	No
ringmaster	Yes	No	No	No

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

emcee: a person who acts as host at formal occasions (makes an introductory speech and introduces other speakers)
ringmaster: the person in charge of performances in a circus ring

Other hyponyms of emcee include compere, Lord of Misrule, question master, quizmaster, symposiarch, toastmaster.

emcee (noun)	ringmaster (noun)
a person who acts as host at formal occasions (makes an introductory speech and introduces other speakers)	the person in charge of performances in a circus ring

emcee (verb)	ringmaster (verb)
act as a master of ceremonies