Gum

A number of different things are called "gum":

 Gums, or gingiva, the soft tissue partly covering teeth

 Chewing gum, a type of confectionery
 Bubble gum
 Functional gum
 Gum base
 Gum industry

 Vegetable gums, natural gums:
 Guar gum
 Gum arabic
 Xanthan gum

 Postage stamp gum

 Gum Springs, Arkansas, a town

 Trees:
 Gum tree (Eucalyptus; Australia and cultivated in other warm areas)
 Black gum (Tupelo, Nyssa; eastern North America)
 Sweet-gum (Liquidambar; eastern North America and Asia)
 Log gum 

Astronomy:
 Gum (crater), on the Moon
 Gum Nebula, an emission nebula
 Colin Stanley Gum (1924-1960), Australian astronomer 

See also: GUM