What part of speech is goldbrick?

Goldbrick can be categorized as a noun and a verb.

Parts of speech

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

Verb
goldbrick - To shirk or malinger.
goldbrick - To swindle.
Noun
goldbrick - an idle worthless person
goldbrick - anything that is supposed to be valuable but turns out to be worthless
goldbrick - a soldier who performs his duties without proper care or effort
goldbrick - a brick-shaped block that looks like gold but is not