band saw vs bandsaw

band saw and bandsaw both are nouns.

Word	Noun	Adjective	Verb	Adverb
band saw	Yes	No	No	No
bandsaw	Yes	No	No	No

As nouns, band saw and bandsaw are synonyms defined as:

band saw and bandsaw: an endless saw consisting of a toothed metal band that is driven around two wheels

band saw (noun)	bandsaw (noun)
an endless saw consisting of a toothed metal band that is driven around two wheels	an endless saw consisting of a toothed metal band that is driven around two wheels