semaphore telegraph vs shutter telegraph chain

semaphore telegraph and shutter telegraph chain both are nouns.

Word	Noun	Adjective	Verb	Adverb
semaphore telegraph	Yes	No	No	No
shutter telegraph chain	Yes	No	No	No

semaphore telegraph (noun)	shutter telegraph chain (noun)
a tower with pivoting shutters, also known as blades or paddles, used for conveying information by means of visual signals, read when the shutter is in a fixed position.	a system of conveying information by means of visual signals, using towers with pivoting shutters; information is encoded by the position of the mechanical elements.