I know this is a rather old question, but nothing appears to have been done about it yet.
I would argue that they should both be synonyms of graphic-effects, glow and bloom seem a bit too 'low-level' to be useful in their own right. Also 15 questions is a pretty low number to be a reasonable categorization.
I would expect someone who was interested/knows a lot about bloom effects would also be interested/know a lot about glow effects.
I don't think they're synonymous.
When I think of Bloom I think of Wikipedia's definition
The effect produces fringes (or feathers) of light extending from the borders of bright areas in an image, contributing to the illusion of an extremely bright light overwhelming the camera or eye capturing the scene.
Where as I think of glow as just making something emit light.
I like to think of it as you can make an object glow in a game, then you can apply bloom to it.
Yes they should be merged. <EOM>
Just kidding; not end of the message. I just don't have any particular justification for my opinion other than generally disagreeing with the other answer. Even if there is some slight difference in some definition, on this site they are used interchangeably.