What is the difference between 'speculative', 'hypothetical' and 'conjectural'?
A hypothesis in a scientific sense is an idea based on existing evidence, that can be tested. Speculation isn't necessarily based on anything, and may not be provable.
Speculative is based on arbitrary assumptions, while hypothetical is based on certain priori reasoning or could also be imaginative.
Speculative is often used in context of betting and waging:
Generating something hypothetical is a good tool in scientific research, proposals and education: