calabar / calabur / caliber [ˈkæləbɜr]
calabar – n. – poisonous seeds of the African vine, Physostigma venemosum containing alkaloids used in medicine.
calabur – n. – a tropical American shrub, Muntingian calabura, which bark yields a silky fiber used in cordage, and whose wood is valuable for staves, also called Jamaica cherry or silkwood.
caliber – n. – 1. the internal diameter of a tube; 2. strength of character