Thesaurus / wouldbe
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

EXAMPLE SENTENCES FROM THE WEB

July 17: A little upset by the episode of the wouldbe assassin, I decided to go up to London for the day.
Many criminals are acquitted who wouldbe convicted if the penalty were imprisonment.
PUBLIC SPEAKINGCLARENCE STRATTON
A big word that Mr. Wouldbe uses where Mr. Is uses the little word live.
THE VERBALISTTHOMAS EMBLY OSMUN, (AKA ALFRED AYRES)