Synonyms for Covering (same or very similar meaning)
WordNet sense 1 (a natural object that covers or envelops):
cover, natural coveringWordNet sense 2 (the act of concealing the existence of something by obstructing the view of it):
screening, maskingWordNet sense 3 (the work of applying something):
application, coatingFrom the ODE community, based on WordNetadd/edit