telecommunication vs simplex

telecommunication is a noun but simplex is not a noun.

Word	Noun	Adjective	Verb	Adverb
telecommunication	Yes	No	No	No
simplex	No	Yes	No	No

telecommunication (noun)	simplex (noun)
(often plural) the branch of electrical engineering concerned with the technology of electronic communication at a distance
(often plural) systems used in transmitting messages over a distance electronically

telecommunication (adjective)	simplex (adjective)
	having only one part or element
	allowing communication in only one direction at a time, or in telegraphy allowing only one message over a line at a time