I'm not what you mean here... in both cases, 'bro' is a noun. 'Crypto bro' is a noun phrase where 'crypto' is an 'attributive noun' (functioning similarly to an

I'm not what you mean here... in both cases, 'bro' is a noun. 'Crypto bro' is a noun phrase where 'crypto' is an 'attributive noun' (functioning similarly to an adjective).