telecom vs telephone

telecom and telephone both are nouns.

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

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

telecom: (often plural) systems used in transmitting messages over a distance electronically
telephone: transmitting speech at a distance

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

telecom (noun)	telephone (noun)
(often plural) systems used in transmitting messages over a distance electronically	electronic equipment that converts sound into electrical signals that can be transmitted over distances and then converts received signals back into sounds
	transmitting speech at a distance

telecom (verb)	telephone (verb)
	get or try to get into communication (with someone) by telephone