Money is unreal, meaning imaginary, intangible - a concept.
Currency is NOT money, but merely represents money.
For me bitcoin is both currency and money which the value is always increase and if you want to convert into money you can do anytime.This is what bitcoin can really defined how important to our society.
perhaps what can be called money is when the goods have real shape and are not affected by inflation, usually the ancients used gold, silver, etc as money. but nowadays the times are getting ahead where more currency is used for payment. and bitcoin itself may be interpreted to currency because it has no physical shape and fluctuate?