Core rule: the book introduces direct ism al-tafḍīl from an unaugmented triliteral past verb: أَفْعَلُ for masculine singular and فُعْلَى for feminine singular.
k-b-r → أَكْبَرُ / كُبْرَى.
ṣ-gh-r → أَصْغَرُ / صُغْرَى.
ʿ-l-m → أَعْلَمُ.
Simply attaching hamzah to any word is not enough; the root and entire pattern must be right. Classical morphology also has lexical/grammatical restrictions on direct comparatives, so the beginner rule is not an unlimited licence to coin forms.
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The source’s triliteral-base rule
Ism al-Tafḍīl: Meaning, Eight Forms, Patterns and Use
Core rule: the book introduces direct ism al-tafḍīl from an unaugmented triliteral past verb: أَفْعَلُ for masculine singular and فُعْلَى for feminine singular.
k-b-r → أَكْبَرُ / كُبْرَى.
ṣ-gh-r → أَصْغَرُ / صُغْرَى.
ʿ-l-m → أَعْلَمُ.
Simply attaching hamzah to any word is not enough; the root and entire pattern must be right. Classical morphology also has lexical/grammatical restrictions on direct comparatives, so the beginner rule is not an unlimited licence to coin forms.