basehead

As a noun basehead is

(us) a habitual user of freebase; a crackhead.

As nouns the difference between crackhead and basehead

is that crackhead is a person who is addicted to or regularly uses crack cocaine while basehead is a habitual user of freebase; a crackhead.

As nouns the difference between freebase and basehead

is that freebase is (chemistry) the purified, dry form of an amine, especially an alkaloid natural product, that is normally used in solution while basehead is (us) a habitual user of freebase; a crackhead.

As a verb freebase

is to purify a drug by crystallization.