Collocations for conjecture - noun

pure
Whether the business will survive another ten years is pure conjecture.

just, mere, only
These are mere conjectures on our part.

conjecture about, conjecture as to
There was a lot of conjecture as to the extent of her wealth.

a matter for conjecture
Whether she will run for a second term in office is a matter for conjecture.

open to conjecture (esp. BrE)