Covering
Part of speech: noun
Definition: That which covers something. Action of the verb to cover.
Part of speech: verb
Definition: To place something over or upon, as to conceal or protect.
Example sentence: As a beat reporter covering the CIA and intelligence world after the terrorist attacks of 2001, I could sense that many things I couldn't see or understand were changing, expanding, getting so big they were difficult to manage.
Coating
Part of speech: noun
Definition: A thin outer layer.
Part of speech: verb
Definition: To cover with a coating of some material.