Which mistake should be avoided in parsing كَرَاهِيَةٌ?

Noun Patterns: Jāmid, Maṣdar, Mushtaq and 50 Basic-Triliteral Maṣdar Entries

• Calling it the pattern of raḥma solely because both end in tāʾ
• Checking its radicals
• Checking alif placement
• Counting its letters