Just to put an actual scientific twist on this brown/grizzly etc thing:
Taxonomy: While there has been much confusion about the taxonomy of brown bears (Ursus arctos), taxonomists agree there are at least two subspecies in North America -- the grizzly bear (U. a. horribilis) and the Kodiak bear (U. a. middendorffi). There is confusion about whether to consider others, like U. a. gyas and U. a. macfarlani, as separate subspecies. The Kodiak bear has lived separately on Kodiak, Afognak, and Shuyak Islands in southwestern Alaska for thousands of years with no interbreeding with other populations. However, there is no such geographic demarcation between the coastal U. a. gyas and the inland U. a. horribilis. There is a continuum of difference between the larger coastal brown bears and the interior individuals that are generally called grizzly bears. Coastal brown bears have a greater amount of animal protein in their diet, achieve larger size, and have slight differences in coloration. At any point from the coast to the interior there is interbreeding between the populations (Jonkel 1987, p 456-473).
Griz and Kodiaks are subspecies of brown. Browns are NOT bigger than grizzlies, Grizzlies are a subset of browns. Kodiaks may be bigger than grizzlies but they are an orthoganal subset of the browns. Neither are bigger or small than Brown bears, as they ARE brown bears
g'nite all!