bruin
Synonym discussion
Sense: noun/1
Bear is the normal everyday word for this animal and is the safest choice in almost all writing. Bruin names the same creature, but it is far rarer and usually sounds more colorful or old-fashioned. Brown bear is the neutral species label when you want biological accuracy, while grizzly usually points to a large North American type of brown bear. Use bear in ordinary speech, use brown bear in wildlife or science contexts, and choose bruin only when a more vivid tone fits. A park notice would say 'Do not approach the bear,' but a storyteller might write 'A tired bruin came down to the river.'
Etymology
Bruin comes from a Dutch word meaning 'brown'. In older animal stories, Brown became a name for the bear, and English later took bruin as another word for the animal.