two-handed saw vs lumberman's saw

two-handed saw and lumberman's saw both are nouns.

Word	Noun	Adjective	Verb	Adverb
two-handed saw	Yes	No	No	No
lumberman's saw	Yes	No	No	No

As nouns, two-handed saw and lumberman's saw are synonyms defined as:

two-handed saw and lumberman's saw: a saw with handles at both ends; intended for use by two people

Other synonyms of two-handed saw include two-man saw, whipsaw.

two-handed saw (noun)	lumberman's saw (noun)
a saw with handles at both ends; intended for use by two people	a saw with handles at both ends; intended for use by two people