We found one dictionary that defines the word knockbuster:

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1. knockbuster: Wiktionary

Definitions from Wiktionary (knockbuster) ▸ noun:  Synonym of mockbuster ▸ Words similar to knockbuster ▸ Usage examples for knockbuster ▸ Idioms related to knockbuster ▸ Wikipedia articles (New!) ▸ Popular adjectives describing knockbuster ▸ Words that often appear near knockbuster ▸ Rhymes of knockbuster ▸ Invented words related to knockbuster