[1] : The Collaborative International Dictionary of English v.0.48

cola nut \cola nut\, cola seed \cola seed\ . bot.
   the bitter fruit of cola acuminata, which is nearly as
   large as a chestnut, and furnishes a stimulant, which is used
   in medicine.
   webster 1913 suppl.
see also:
cola acuminata 

[2] : WordNet (r) 2.0

cola nut
     n : bitter brown seed containing caffein; source of cola extract
         syn: kola nut
see also:
kola nut 

Cola Nut >> C Words
Cola Nut, definition of term: Cola Nut
cola+nut_pag1.html

Cola >> C Words
Cola, definition of term: Cola
cola_pag1.html

Coca Cola >> C Words
Coca Cola, definition of term: Coca Cola
coca+cola_pag1.html

Cashew Nut >> C Words
Cashew Nut, definition of term: Cashew Nut
cashew+nut_pag1.html

Betel Nut >> B Words
Betel Nut, definition of term: Betel Nut
betel+nut_pag1.html

Brazil Nut >> B Words
Brazil Nut, definition of term: Brazil Nut
brazil+nut_pag1.html

Bolt And Nut >> B Words
Bolt And Nut, definition of term: Bolt And Nut
bolt+and+nut_pag1.html