Word / formMeaning / explanation
سَرْوَلَةفَعْوَلَة without initial tāʾ; assimilated to an unaugmented quadriliteral.
تَسَرْوُلتَفَعْوُل with initial tāʾ; a first-subgroup augmented parallel.
اِسْلِنْقَاءneither of those templates; a second-subgroup augmented parallel.
The verbal-noun pattern and its formative elements are the primary evidence for classification. Its lexical meaning is then interpreted in context.