breakthrough (n.)

• aggression
• assault
• attack
• blitz
• blitzkrieg
• boost
• charge
• coinage
• counterattack
• counteroffensive
• discovery
• diversion
• drive
• exordium
• foreword
• frontispiece
• hike
• increase
• infiltration
• innovation
• introduction
• invention
• leap
• megadeath
• mugging
• neologism
• novelty
• offense
• offensive
• onset
• onslaught
• overkill
• overture
• postulate
• preamble
• preface
• prefix
• preliminary
• prelude
• premise
• presupposition
• prolegomenon
• prolepsis
• prologue
• push
• rush
• sally
• sortie
• strike
• upgrade
• verse
• voluntary
• wax