Defect or issuePrincipal resource
Unfamiliar vocabularyLexicology
Morphological irregularitySarf
Weak compositionNahw
Verbal complexityNahw and syntactic analysis
Harshness of sounds or word-sequencesCultivated auditory taste
Semantic complexityBayan
The table shows how established language disciplines support rhetorical study. A particular case may require rules, attested usage, and linguistic taste together; these are principal aids, not sealed compartments.