chapter  4
Receptive vs. Productive Vocabulary
Definitions
Pages 14

You have enough information to be in receptive control of these two “words,” so you are able to understand the above sentences. If we give you the actual words (assassinate and massacre, respectively), you are able to tap into the fully specified information that you possess as a native speaker and use them correctly in sentences. In other words, you are now in productive control of these words.