Omission: Four circuits of the principal tawaf remain undone, so the required rite itself is incomplete and ihram consequences continue.
Delay: The principal tawaf is completed, but after the prescribed days; Abu Hanifah specifies dam for that lateness. One concerns completion, the other timing. They are not interchangeable.
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Bab Jinayat al-Muhrim — Tawaf Purity, Missed Rites and Expiations (Part III)
Omission: Four circuits of the principal tawaf remain undone, so the required rite itself is incomplete and ihram consequences continue.
Delay: The principal tawaf is completed, but after the prescribed days; Abu Hanifah specifies dam for that lateness. One concerns completion, the other timing. They are not interchangeable.