American organ and Free-reed instrument

American organ noun - A free-reed instrument in which air is drawn in through reeds by suction bellows.

Free-reed instrument and American organ are semantically related. In some cases you can use "Free-reed instrument" instead a noun phrase "American organ".

Free-reed instrument noun - A wind instrument with a free reed.

American organ and free-reed instrument are semantically related. Sometimes you can replace phrase "American organ" with "Free-reed instrument", this phrases are similar.