Guava is plural of guayabo. Guayabo is a tree in the family Myrtaceae. guava common has the scientific name for Psidium guajaba. There are about 100 species. The fruit is the guava. Sweets and snacks are made in Colombia. In Colombia also we tell Guayabo hangover, the raw. To a loving desecpcion also you can say you guava or tusa.