television vs telecom system

television and telecom system both are nouns.

Word	Noun	Adjective	Verb	Adverb
television	Yes	No	No	No
telecom system	Yes	No	No	No

As nouns, telecom system is a hypernym of television; that is, telecom system is a word with a broader meaning than television:

television: a telecommunication system that transmits images of objects (stationary or moving) between distant points
telecom system: a communication system for communicating at a distance

Other hypernyms of television include telecom equipment, telecommunication equipment, telecommunication system.

television (noun)	telecom system (noun)
a telecommunication system that transmits images of objects (stationary or moving) between distant points	a communication system for communicating at a distance
an electronic device that receives television signals and displays them on a screen
broadcasting visual images of stationary or moving objects