There are a variety of synonyms for the phrase "by mouth" that can be used to convey the same message in different ways. Some examples of these synonyms include verbally, vocally, orally, and colloquially. When describing communication or transmission of information, other options include word of mouth, spoken, or through conversation. Additionally, there are medical terms such as per os (PO) or orally, which refer to taking medication by mouth. Regardless of which phrase is used, the meaning remains the same - the information or medication is being conveyed through the use of speech and the oral cavity.