I have trouble differentiating between gourd, squash, and melon. Chinese call pumpkin "Melon of the South." The English dictionary states that pumpkin is a gourd-like squash. The word pumpkin originates from the word pepon, which is Greek for "large melon."
Pumpkins vary greatly in shape, ranging from oblate to oblong. Ob-La-Di, Ob-La-Da, la la...how the life goes on.