lumberman vs lumberjack

lumberman and lumberjack both are nouns.

Word	Noun	Adjective	Verb	Adverb
lumberman	Yes	No	No	No
lumberjack	Yes	No	No	No

As nouns, lumberman and lumberjack are synonyms defined as:

Other synonyms of lumberman include faller, feller, logger.

lumberman (noun)	lumberjack (noun)
a person who fells trees	a short warm outer jacket
	a person who fells trees