Yes you're right bitcoin is a cryptocurrency. But what is cryptocurrency? Cryptocurrency /ˈkrɪptəʊˌkʌr(ə)nsi"/(noun) It is a digital currency in which encryption techniques are used to regulate the generation of units of currency and verify the transfer of funds, operating independently of a central bank. So, a cryptocurrency represents a bitcoin and bitcoin is a cryptocurrency as mention above so currency represents money then bitcoin is both a cryptocurrency and used as money.