what-if

Noun

 * 1)  A speculation as to what might have happened if something else had happened earlier.
 * 2)  A hypothetical case or situation, usually evoked by a sense of anxiety or uncertainty.
 * 1)  A hypothetical case or situation, usually evoked by a sense of anxiety or uncertainty.

Verb

 * 1)  To speculate about the consequences of something that could have happened.