Nouns

(n)organa fully differentiated structural and functional unit in an animal that is specialized for some particular function
(n)organa government agency or instrument devoted to the performance of some specific function“The Census Bureau is an organ of the Commerce Department”
(n)electric organ, electronic organ, Hammond organ, organ(music) an electronic simulation of a pipe organ
(n)organa periodical that is published by a special interest group“the organ of the communist party”
(n)organ, pipe organwind instrument whose sound is produced by means of pipes arranged in sets supplied with air from a bellows and controlled from a large complex musical keyboard
(n)harmonium, organ, reed organa free-reeded instrument with a piano keyboard in which air is forced through the reeds by bellows