Collocation Dictionary
Common collocations with conjecture in American Collocation
mere
pure
This is pure conjecture on my part, as I’m not really qualified to comment.
be conjecture
be a matter for
be a matter of
be open to
The site of the battle is a matter of conjecture.
show conjecture is right/wrong
confirm
disprove
prove
support
Unfortunately no evidence exists to prove the conjecture.