Answer:
Plant whose name sounds like a dish full of dairy spread.
I am the greatest teacher out of them all, but alas in the end I kill my pupils.
People are hired to get rid of me. I'm often hiding under your bed. In time I'll always return you see. Bite me and you're surely dead.
Looks like water, but it's heat. Sits on sand, lays on concrete. A play on the eyes, but it's all lies.
A building where people and stories are on stage
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.