As a noun guiro
As a proper noun giro is
(cycling) the giro d'italia.
As a verb guido
As a noun guiro is
As nouns the difference between pua and guiro
is that pua
is a scraper or stick used to play a guiro while guiro
is a musical instrument made of a hollow gourd with parallel notches cut in one side, and played by rubbing a stick or scraper ("pua") along the notches to produce a ratchet-like sound.