telephone vs phone call

telephone and phone call both are nouns.

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

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

Other hyponyms of telephone include voice mail, voicemail, call, telephone call, call forwarding, call waiting.

telephone (noun)	phone call (noun)
electronic equipment that converts sound into electrical signals that can be transmitted over distances and then converts received signals back into sounds	a method of contacting a person by phone
transmitting speech at a distance

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