telecom vs broadcasting

telecom and broadcasting both are nouns.

Word	Noun	Adjective	Verb	Adverb
telecom	Yes	No	No	No
broadcasting	Yes	No	No	No

As nouns, broadcasting is a hyponym of telecom; that is, broadcasting is a word with a more specific, narrower meaning than telecom:

telecom: (often plural) systems used in transmitting messages over a distance electronically
broadcasting: taking part in a radio or tv program

Other hyponyms of telecom include telephone, telephony, telegraphy, wireless, multiplex, phototelegraphy.

telecom (noun)	broadcasting (noun)
(often plural) systems used in transmitting messages over a distance electronically	taking part in a radio or tv program
	a medium that disseminates via telecommunications