The two forms are easiest to distinguish by the added material.
Main added featureExampleBab
Initial ت + rule states ا before final root letterتَعَفْرَتَ4
Initial ت + و between 1st and 2nd root lettersتَجَوْرَبَ5
Their Masdars are تَعَفْرُتٌ and تَجَوْرُبٌ.
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Attached Derived Quadrilateral - Bab 4: Tafallul & Bab 5: Tafaw'ul
The two forms are easiest to distinguish by the added material.
Main added featureExampleBab
Initial ت + rule states ا before final root letterتَعَفْرَتَ4
Initial ت + و between 1st and 2nd root lettersتَجَوْرَبَ5
Their Masdars are تَعَفْرُتٌ and تَجَوْرُبٌ.