dais vs rostrum

dais and rostrum both are nouns.

Word	Noun	Adjective	Verb	Adverb
dais	Yes	No	No	No
rostrum	Yes	No	No	No

As nouns, dais and rostrum are synonyms defined as:

dais and rostrum: a platform raised above the surrounding level to give prominence to the person on it

Other synonyms of dais include ambo, podium, pulpit, soapbox, stump.

dais (noun)	rostrum (noun)
a platform raised above the surrounding level to give prominence to the person on it	beaklike projection of the anterior part of the head of certain insects such as e.g. weevils
	a platform raised above the surrounding level to give prominence to the person on it