Haemo- is a prefix that is commonly used in medical terminology. It refers to blood or blood-related issues. However, there are several other synonyms for the word "haemo-" that can be used in place of the prefix. These synonyms include "hemo-" and "hemato-". Both "hemo-" and "hemato-" can be used interchangeably with "haemo-" and typically refer to blood or blood-related conditions. Other synonyms that may be less commonly used but still acceptable include "sangui-" and "sanguino-". Incorporating the correct synonym for "haemo-" can assist in clear communication in medical settings.