Capsicin :: Capsicin (n.) A red liquid or soft resin extracted from various species of capsicum.
Capsicine :: Capsicine (n.) A volatile alkaloid extracted from Capsicum annuum or from capsicin.
Capsicum :: Capsicum (n.) A genus of plants of many species, producing capsules or dry berries of various forms, which have an exceedingly pungent, biting taste, and when ground form the red or Cayenne pepper of commerce..