Shamelessly stolen from a bear group. 
Admirer
a term that refers to someone who is sexually or romantically attracted to Bears (this term is often used in various communities to describe an outsider who has sexual attraction to people within that community). Also often referred to as a Chaser. Admirers/Chasers can be of any weight, hairy or hairless and any age.
Bear
a hairy hyper-masculine man with a stocky or heavyset build and facial hair. Can be of any age.
Bear run
a gathering or circuit party for Bear/Cub types and their Admirers.
Bear soup
a swimming pool or hot tub full of bears which usually includes lots of group cuddling and frolicking. These are common place at Bear runs.
Bearwich
a menage a trois consisting of two bears and an admirer. Also common at Bear runs.
Black Bear
is a bear of African-American descent.
Brown Bear
is a bear of Latin descent.
Cub
a younger (or younger looking) version of a Bear, typically but not always with a smaller frame. The term is sometimes used to imply the passive partner in a relationship. Can be hairy or hairless.
Daddy Bear
is an older guy sometimes looking for a daddy/boy relationship with either a younger Bear, Cub, Otter, Wolf or Chaser.
Ewok
a short bear (also known as a Pocket). e.g. Danny de Vito.
Ginger Bear
a Bear with red hair
Gobi Bear
a heterosexual male who is Bear friendly.
Goldilocks
a female, often heterosexual, who is often in the company of Bears (a Bear's fag hag). Also can be referred to as an Ursula.
Grizzly Bear
means that the individual is extremely dominant and typically extremely tall, heavy, or hairy.
Gummy Bear
A Bear who dates or is exclusively attracted to other bears. As in, ‘They stick together like gummy bears.’ Has also referred to Bears with a latex fetish.
Hunter
aggressive Chaser/Admirer who is sexually attracted to Bears to the point of fetishism.
Koala Bear
is a Bear of Australian descent.
or
a Bear with blond hair
Leather Bear
A Bear with a leather fetish.
Muscle Bear/Muscle cub
a muscular version of a Bear. A muscle cub is a younger or smaller, yet muscular, version. Can be of any age.
Otter
a man who is hairy, but is not large or stocky - typically thinner, or with lean muscle. Slimmer version of a Bear with little pockets of fat like love handles or a tiny gut, but not as lean as a Wolf.
Panda bear
a Bear of Asian ethnicity. A panda cub is younger version. Usually hairless.
Pocket Bear (Ewok)
describes a bear of short stature.
Polar bear
a silver- or white-haired Bear.
Spirit Bear
a Bear that approaches his sexuality and 'inner bear' from a spiritual stand point. Usually rooted in various international and cultural references and traditions. Notably present in pagan communities where being gay is predominantly accepted.
Ursula
lesbian Bear. e.g. Rosie O’Donnell.
Wolf
a lean, masculine, aggressive, gay man who is attracted to Bears and involved in the Bear scene.
Wolfman
rare term referring to Trans Bears (FTMs), specifically denotes having transitioned from no body hair to bearishly hairy.
Woof
A greeting often used when a Bear spots another Bear in public and wants to express physical attraction. He might make a growling noise (‘Grrr!’) or say ‘Woof!’