The root of اِسْتَعَانَ is ع و ن, and the verb means “to seek help.” Its verbal noun is اِسْتِعَانَةٌ.
CategoryForm
Active perfectاِسْتَعَانَ
Active imperfectيَسْتَعِينُ
Verbal nounاِسْتِعَانَةٌ
Active participleمُسْتَعِينٌ
Passive perfectاُسْتُعِينَ
Passive imperfectيُسْتَعَانُ
Passive participleمُسْتَعَانٌ
Imperativeاِسْتَعِنْ
Prohibitionلَا تَسْتَعِنْ
مُسْتَعِينٌ means the person seeking help, whereas مُسْتَعَانٌ refers to the one from whom help is sought. The same event is viewed from different grammatical roles.