phone call vs telephone

phone call and telephone both are nouns.

Word	Noun	Adjective	Verb	Adverb
phone call	Yes	No	No	No
telephone	Yes	No	Yes	No

As nouns, telephone is a hypernym of phone call; that is, telephone is a word with a broader meaning than phone call:

Other hypernyms of phone call include telephony.

phone call (noun)	telephone (noun)
a method of contacting a person by phone	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

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