Hebrew words occurring less than 50x. In progress. More words regularly added.
Hifil has specific prefix Hi. In the imperfect it is always letter patah under the its prefix.
Hitpael has specific prefix Hit. It has doubled middle letter in its root (dagesh), in all its forms. In the imperfect shewa is present under the prefix (under taw). Imperfect prefix letter substitutes H in Hitpael prefix.