Is bilk a noun or a verb?

The word 'noun' is a noun, a thing.

The word have is a verb (have, has, having, had) and an auxiliary (helper verb), for example 'have been', 'have studied', or 'have played'.

"If" is a conjunction.

a noun is something that names a person place or thing like girl , Washington , or pencila verb is an action word like, Mary kicked the ball over the fence. or Joe slammed his head on the wall.

Her is a possessive adjective, neither a noun, nor a verb.