If you’ve highlighted some words to create a vocabulary list and clicked the Vocabulary button on the Read&Write for Google Chrome toolbar
You should see the message below and a new Google Doc should be created for the vocabulary list:
If a new Doc doesn’t open, it's likely that permissions haven't been fully granted for Read&Write for Google Chrome:
Please read Allowing or removing permissions for instructions to revoke permissions and prompt to grant access.
For more information about creating vocabulary lists or they come up blank, please read My vocabulary list is coming up blank