climber

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One that climbs, especially a person who climbs mountains.
• noun Sports A device, such as a crampon, used in mountain climbing.
• noun A plant that climbs.
• noun A person who avidly seeks a higher social or professional position.

from The Century Dictionary.

• To climb; mount with effort; clamber.
• noun One who or that which climbs, mounts, or rises; one who ascends by labor or effort.
• noun In botany, a plant that rises by attaching itself to some support; specifically, in England, the virgin's-bower, Clematis Vitalba.
• noun plural In ornithology, the birds of the old order Scansores, as the parrots, cockatoos, woodpeckers, etc.: so called from their climbing habits. They have two toes before and two behind.
• noun A locomotive with driving-wheels fitted to a cog-rail, for ascending steep grades.
• noun plural Same asclimbing-irons.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Bot.) A plant that climbs.
• noun (Zoöl.) A bird that climbs, as a woodpecker or a parrot.
• intransitive verb obsolete To climb; to mount with effort; to clamber.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A person who climbs.
• noun A plant that climbs, such as a vine.
• verb obsolete To climb; to mount with effort; to clamber.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a vine or climbing plant that readily grows up a support or over other plants
• noun someone who climbs as a sport; especially someone who climbs mountains
• noun someone seeking social prominence by obsequious behavior
• noun someone who ascends on foot
• noun an iron spike attached to the shoe to prevent slipping on ice when walking or climbing