achillobursitis
Medical term for inflammation of the bursa near the Achilles tendon. Rare outside clinical contexts.
Achillobursitis can cause pain behind the heel.
Achilles tendinitis, inflammation of the tendon itself, not the bursa.
Compound of アキレス腱 (Achilles tendon) + 滑液嚢 (bursa) + 炎 (inflammation).