If I understand your question correctly, you are only interested in extracting words from a column containing natural text. If so, then you can use the Extract with Regular Expression processor in a Prepare Recipe. For example, in a column containing home descriptions, I may want to extract the words: Coronavirus, basement and Beautiful. I can use the following pattern to find those words ((?:Coronavirus|basement|Beautiful)), and create a new column shown below:
If you have version 9.0.0 or above, this process is even easier using the Smart Pattern Builder. Instead of writing your own regex expression, you can simply highlight the words from the text that you want to extract.
As for bag of words and word embeddings, these are not used for text extraction. We would need to know more about your use case in order to give further guidance.
I hope this is helpful!