Rancour is a strong feeling of resentment or BITTERNESS, and is often used to describe a long-standing feud between two people or groups. It is related to many other words, such as ACRIMONY (8 letters), SPITE (5 letters), GALL (4 letters), BITTERNESS (10 letters), MALEVOLENCE (11 letters), VENOM (5 letters), MALICE (6 letters), BILE (4 letters), HATRED (6 letters), GRUDGE (6 letters), SPLEEN (6 letters) and HATE (4 letters). All of these words are used to describe a deep-seated animosity or ill will towards someone or something.