Bogeys are the smallest of the three, ranging anywhere from a few inches to nearly two feet. They like to live inside houses, often in cupboards, attics, etc. We haven't heard of any lab infestations but imagine they could find plenty of places in a modern evil science lab to tuck away in as well. They are more annoying than anything else, hiding things, causing food to spoil, that sort of thing. We imagine they could ruin an awful lot of experiments.
Goblins are a little larger, usually one to three feet, but sometimes much larger or smaller.
In addition to working alone and carrying out activities virtually identical to Bogeys, Goblins can gather in groups and perform more seriously destructive acts. Arson, theft, and even murder is not unheard of. Whereas Bogeys are almost as ephemeral as nature spirits and therefore almost impossible to kill, Goblins are much more corporeal. Standard conventional weapons will suffice and infrared optics will allow their detection. They also tend to be frightened by fire and large gatherings of people.