work flow vs workflow

work flow and workflow both are nouns.

Word	Noun	Adjective	Verb	Adverb
work flow	Yes	No	No	No
workflow	Yes	No	No	No

As nouns, work flow and workflow are synonyms defined as:

work flow and workflow: progress (or rate of progress) in work being done

work flow (noun)	workflow (noun)
progress (or rate of progress) in work being done	progress (or rate of progress) in work being done