Inopportunity :: Inopportunity (n.) Want of opportunity; unseasonableness; inconvenience.
Opportunism :: Opportunism (n.) The art or practice of taking advantage of opportunities or circumstances, or of seeking immediate advantage with little regard for ultimate consequences..
Opportunist :: Opportunist (n.) One who advocates or practices opportunism.
Opportunity :: Opportunity (n.) Fit or convenient time; a time or place favorable for executing a purpose; a suitable combination of conditions; suitable occasion; chance.
Opportunity :: Opportunity (n.) Convenience of situation; fitness.