Multi custom entity extraction

New to Rasa and looking for the best option for extracting multiple custom entities from a single user input.

Example: “I need help with a python error. I’m using the requests library to make a rest call and getting a timeout”

Extraction: [python, requests, rest]

So far I’ve tried using list type slot and lookup table with a list of terms to pull out with limited success.

Is there a better way to do this if I have a list of items to extract?

Thanks in advance!