"MM" is a commonly used sound that we make in everyday conversations, often to express uncertainty or hesitation. This sound can have multiple synonyms, depending on the context and tone in which it is used. Some common synonyms for "MM" include "hmm," "uh-huh," "yeah," "I see" and "got it." These words are often used interchangeably and have similar meanings in most situations. However, depending on the context, some synonyms may be more appropriate than others. In the end, the choice of words comes down to personal preference, the speaker's intentions, and the listener's interpretation.