long-distance call vs trunk call

long-distance call and trunk call both are nouns.

Word	Noun	Adjective	Verb	Adverb
long-distance call	Yes	No	No	No
trunk call	Yes	No	No	No

As nouns, long-distance call and trunk call are synonyms defined as:

long-distance call and trunk call: a telephone call made outside the local calling area

Other synonyms of long-distance call include long distance.

long-distance call (noun)	trunk call (noun)
a telephone call made outside the local calling area	a telephone call made outside the local calling area