Hairy = Bumblebee;
Not Hairy (bold) = Carpenter bee;
Carpenter bees are only blackish;
Bumblebees can be blackish or yellow-striped or whatever.
To know if the big buzzing black insect is a carpenter bee or a bumblebee as far as I know it's the "fur" which is decisive. Not an entomologist, the mileage of your bee can vary.