When extra material appears at the end of an expression, the case differs from an initial or medial insertion. Distinctions involving a single or multiple additional final letters lead to names such as muṭarraf and mudhayyal.
In «عواص» versus «عواصم», the final mīm produces a distinct word with strong initial overlap but unequal letter count. Some poetic figures similarly obtain their effect from related final sequences.
Rhyme alone is not enough: the subtype of jinās must be determined by comparing the relevant whole words, not just the endings of lines.