ventriloquism vs prowess

ventriloquism and prowess both are nouns.

Word	Noun	Adjective	Verb	Adverb
ventriloquism	Yes	No	No	No
prowess	Yes	No	No	No

As nouns, prowess is a hypernym of ventriloquism; that is, prowess is a word with a broader meaning than ventriloquism:

ventriloquism: the art of projecting your voice so that it seems to come from another source (as from a ventriloquist's dummy)
prowess: a superior skill that you can learn by study and practice and observation

Other hypernyms of ventriloquism include art, artistry.

ventriloquism (noun)	prowess (noun)
the art of projecting your voice so that it seems to come from another source (as from a ventriloquist's dummy)	a superior skill that you can learn by study and practice and observation