Able to be climbed; having qualities or conditions that make climbing possible or practical.
From climb plus the English suffix -able (capable of being). This adjective describes anything that can be ascended.
Any rock climber knows that 'climbable' is different from 'tall'—a 500-foot cliff face might not be climbable, while a 100-foot rocky slope absolutely is, depending on handholds and angles!
Complete word intelligence in one call. Free tier — 50 lookups/day.