telephony vs telephone

telephony and telephone both are nouns.

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

As nouns, telephony and telephone are synonyms defined as:

telephony (noun)	telephone (noun)
transmitting speech at a distance	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

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