What noun should never be expressed in verb form and what verb should never be expressed in noun form? ~

At this stage in the English language, it seems there are few nouns that can't be verbed and few verbs that can't be nouned. English is flexible like that.

But some I don't like:

I don't want to hear "sex" as a verb on its own (without "have"). Lazy rappers sometimes say things like "she sexin' me" and I'm like: no.

Also, don't use "gift" as a verb; just don't. What's so bad about "give a gift"?

I hear ya!!!  

not sure