I am trying to identify Shorashim from Pesukim and Rashi. Finding the ones from the Pesukim is easy - I use the concordance from alhatorah. But finding the root of words used in Rashi is not always so simple. Do you have any advice?
This is an old set, but may provide you with what you are looking for. It contains indices verb tables, etc.
It was first published in the 1980's by the World Zionist Organization in Hebrew and English and authored by Dr. Sampson A Isserhoff under the title, An Introduction to Rashi's Grammatical Explanations.
He collected all the explanations of grammar found scattered throughout Rashi's commentaries and published them separately. The original set covered all of Chumash and a few volumes of Nach. If you can find it, it is a surprisingly handy text to help in comprehending the Hebrew language.
What follows is the approbation which was written by Rabbi Ahron Soloveichik in 1990.