locomotive engineer vs engine driver

locomotive engineer and engine driver both are nouns.

Word	Noun	Adjective	Verb	Adverb
locomotive engineer	Yes	No	No	No
engine driver	Yes	No	No	No

As nouns, locomotive engineer and engine driver are synonyms defined as:

locomotive engineer and engine driver: the operator of a railway locomotive

Other synonyms of locomotive engineer include engineer, railroad engineer.

locomotive engineer (noun)	engine driver (noun)
the operator of a railway locomotive	the operator of a railway locomotive