Muṭarraf sajʿ occurs when the terminal letters agree but the final words have different patterns. The ending sounds correspond even though the words differ structurally, producing variety within audible coherence.
“waqārā” and “aṭwārā” have a similar final sound; the first broadly follows a faʿāl shape, whereas the second has an afʿāl shape. Rhyme is present without equal word pattern.
The different patterns do not make muṭarraf defective: they identify this type. Mutawāzī adds pattern correspondence to the ending correspondence.