Choosing synonyms for the term "best man" can be a fun task, as there are many options to choose from. Some words that could be used include "groomsman," "chief attendant," "man of honor," "right-hand man," "top aide," "emcee," "master of ceremonies," and "best friend." Depending on the relationship between the groom and the person being referred to, some other terms that could be used may include "brother," "cousin," or "childhood friend." Ultimately, the term used will depend on individual preferences and the nature of the wedding ceremony.