The Italian term "birra, acerbo, amaro" matches the English term "bitter"

other italian words that include "birra" : english :
birra ale
birra beer
birra lager
other italian words that include "acerbo" : english :
acerbo unripe
other italian words that include "amaro" : english :
calamaro cuttlefish
calamaro, polipo octopus
calamaro squid