The message
from Dave contains these words:

For a local race here in Rhode Island there is some debate as to the
definition of a buoy race versus a point-to-point race. For the class I
compete in, there are different rules for each type of race. Pro drivers
are allowed for point-to-point racing but not buoy racing.

One of the races on the schedule is deemed a point-to-point race. The
race course is around an inshore island using all government marks.
Since it's point-to-point pro drivers are allowed.

Some competing in the racing are claiming the around the island race is
improperly designated as a point-to-point race as should really be a
buoy race. Part of the argument is that it's inshore and it ends up in
the same place it started.

I did a goolge search on buoy and point-to-point racing but came up
empty. Can anyone point me to a succint, well accepted definition of
these terms?

All races are both point to point and buoy races.

It is not buoys that are relevant - it is marks of the course.

Round the cans races go from buoy to buoy - that is from the mark
staring a leg to the mark ending a leg - and while on that leg the other
marks are irrelevant.When they cpomplete one leg they start another one
until they have completed the course.

Place to place races usually start and finish between buoys (starting
and finishing marks) and probably require other hazards or navigational
aids to be left to one side or another. That designation makes tham
marks of the course.

If your organisers want to have entry qualifications for particular
races then they need to make it absolutely clear in the Notice of Race
(Sailing Instructions are too late though will normally repeat the
qualification statement)

Stuart
PS There is also the problem of defining "pro drivers" I do not believe
ISAF has such a term.