1. Capable of being ascended
   - ascendable, ascendible 
2. Capable of being surmounted
   - surmountable

See also: passable, scalable

• tallage
• Tallahassee
• Tallapoosa
• Tallapoosa River
• tallboy
• Tallchief
• Talleyrand
• tallgrass
• tallier
• Tallin
• Tallinn
• tallis
• tallish
• tallith
• tallness
• tallow
• tallow oil
• tallowy
• Tallulah Bankhead
• tally
• tally clerk
• tally-ho
• tallyman
• Talmud
• Talmudic