What word names a squash or pumpkin and sounds like "pierced by a bull's horn"?

What is a spring-loaded door fastener called? A squad of guinea pigs tries to stop a diabolical billionaire from taking over the world in which 2009 film? How many square inches are in a square foot? A square, a museum and an office building in which capital are named for Simon Bolivar, born there in 1783? A stadium whose tent-like roof was then the world's largest was built for the 1972 Olympics in which city? A stage musical based on which 1997 film about unemployed steel workers turned strippers opened in 2000? A 2002 stamp for the 100th anniversary of whose birth included the full texts of six of his whimsical poems? A standard round of professional golf has how many holes?