Question

What is a paradox? and an Oxymoron?

Answer 1

An Oxymoron is two opposites used in the same sentence e.g. the shop was busy, but now it is empty

Answer 2

Paradox; a statement or proposition that, despite sound reasoning from acceptable premises, leads to a conclusion that seems senseless, logically unacceptable, or self-contradictory.

Oxymoron; a figure of speech in which contradictory terms appear in conjunction.

Hope this helps :D