Leukaemia, a type of cancer that affects the blood and bone marrow, has various synonyms that are used interchangeably. One of the most common synonyms is blood cancer, which is a broad term for all types of cancers that affect the blood. Another synonym is leucaemia, which is a different version of the same word. Hematologic malignancy is also a synonym that is used to describe cancers that occur in the blood and bone marrow. Lastly, lymphoid malignancy refers to cancers that affect the lymphatic system, which is a crucial component of the immune system. These synonyms are essential as they help individuals understand the nature of leukaemia in different contexts, enabling them to seek the right treatment when diagnosed.