brain-worker vs brainworker

brain-worker and brainworker both are nouns.

Word	Noun	Adjective	Verb	Adverb
brain-worker	Yes	No	No	No
brainworker	Yes	No	No	No

As nouns, brain-worker and brainworker are synonyms defined as:

brain-worker and brainworker: someone whose profession involves using his head to solve problems

brain-worker (noun)	brainworker (noun)
someone whose profession involves using his head to solve problems	someone whose profession involves using his head to solve problems