The simple answer to the question posed in the title of this entry is ‘no’. They are all related but have stark differences.
Lets start with squash.You have summer and winter squash. Summer squash include veggies like zucchinis. They are mild in taste, have edible skin and require little to no cooking to enjoy.
Then we have winter squashes. These include butternut and acorn. Winter squashes require more cooking time and don’t need to be refrigerated. They are also a great source of vitamin A and C!
Pumpkins are part of the gourd family and include watermelons and the traditional Halloween pumpkin. Depending on the type of pumpkin, they can be stored for long periods, like up to a month, without refrigeration.
Gourds, although a part of the squash family, are for the most part inedible. Their main use is decorative. They are often featured in Thanksgiving centrepieces and otherwise used as fall decorations. No two are identical and they come in delightfully crazy shapes and colours. Another bonus, as a decoration, is that they are long lasting. But do not store for the next season. They will eventually deteriorate and rot.
So here is nitty-gritty. Squashes, gourds and pumpkins are all a part of the same genetic family, cucurbita, but the difference between the three are the stems. For loads of additional information check out this incredible resource!