The term 'crypto' is from 'cryptography' basically. In that sense Bitcoin is cryptocurrency. 

But the point is clear: 
Bitcoin is BITCOIN. 

No common noun is required. Just the proper name is enough and clean, and confusing.

Any common name for Bitcoin helps shitcoins. nostr:npub1h882a66p0zj5n69s2u8nfzev4f97lzfnlcej84z78p6uqxge5tpqlupz20 is correct in this regard.