The words that can be used as synonyms for the term "be testimony" are "prove", "attest", "corroborate", "evidence", and "validate". All of these words indicate that something is being shown or demonstrated as true or genuine. For instance, when evidence is presented in a court of law, it serves as a testimony to support or refute someone's claim. Similarly, the word "corroborate" implies that something is being confirmed or supported by another piece of evidence. So, whenever something is stated to be a testimony, it means that it is serving as physical proof or validation for a particular statement or event.