drive line system vs drive line

drive line system and drive line both are nouns.

Word	Noun	Adjective	Verb	Adverb
drive line system	Yes	No	No	No
drive line	Yes	No	No	No

As nouns, drive line system and drive line are synonyms defined as:

drive line system and drive line: mechanism that transmits power from the engine to the driving wheels of a motor vehicle

drive line system (noun)	drive line (noun)
mechanism that transmits power from the engine to the driving wheels of a motor vehicle	mechanism that transmits power from the engine to the driving wheels of a motor vehicle