The word "opposure" doesn't exist in the English language, but if we assume that it is meant to be "exposure," then some synonyms could be "unveiling," "revelation," "disclosure," or "uncovering." These words all imply a revealing of something that was previously hidden or unknown. Other possibilities might include "discovery," "enlightenment," or "unmasking," which all suggest the idea of bringing something to light that was previously concealed or misunderstood. Choosing an appropriate synonym will depend on the context and intended meaning of the sentence in which "exposure" is to be used.