emcee vs toastmaster

emcee and toastmaster both are nouns.

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

As nouns, toastmaster is a hyponym of emcee; that is, toastmaster 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)
toastmaster: the person who proposes toasts and introduces speakers at a banquet

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

emcee (noun)	toastmaster (noun)
a person who acts as host at formal occasions (makes an introductory speech and introduces other speakers)	the person who proposes toasts and introduces speakers at a banquet

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