paca

As nouns the difference between papa and paca

is that papa is dad, daddy, father; a familiar or old-fashioned term of address to one’s father while paca is any of the large rodents of the genus Cuniculus (but see also Cuniculus#Synonyms), native to Central America and South America, which have dark brown or black fur, a white or yellowish underbelly and rows of white spots along the sides.

As an acronym PAPA

is Professional and Amateur Pinball Association, and the tournaments held under its auspices.