organ pipe vs organ

organ pipe and organ both are nouns.

Word	Noun	Adjective	Verb	Adverb
organ pipe	Yes	No	No	No
organ	Yes	No	No	No

organ pipe (noun)	organ (noun)
the flues and stops on a pipe organ	wind 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
	(music) an electronic simulation of a pipe organ
	a free-reeded instrument with a piano keyboard in which air is forced through the reeds by bellows
	a fully differentiated structural and functional unit in an animal that is specialized for some particular function
	a periodical that is published by a special interest group
	a government agency or instrument devoted to the performance of some specific function