telephone jack vs phone jack

telephone jack and phone jack both are nouns.

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

As nouns, telephone jack and phone jack are synonyms defined as:

telephone jack (noun)	phone jack (noun)
a jack for plugging in a telephone	a jack for plugging in a telephone