The verbs are
advise and
recommend. The nouns are
advice and
recommendation.
No, they are not interchangeable, even though the meanings are similar. The usual patterns are:
What do you advise me to do?
What do you recommend (that) I do?
I advise you to see the doctor about that problem.
I recommend (that) you see the doctor about that problem.
You may want to post individual questions about specific sentences using these words.
CJ