What part of speech is freebase?

Freebase can be categorized as a noun and a verb.

Parts of speech

1. freebase is a verb, present, 1st person singular of freebase (infinitive).
2. freebase is a verb (infinitive).
3. freebase is a noun, singular of freebases.

Verb
freebase - To purify such a drug by crystallization.
freebase - To use such a drug by inhalation of the fumes given off when it is burnt.
Noun
freebase - The purified, dry form of an amine, especially an alkaloid natural product, that is normally used in solution.
freebase - This form of cocaine.