The term 'Third Baron Rayleigh' is a unique and specific title that refers to a particular individual in history. However, there are several synonyms for this term that could be used in various contexts. These synonyms include '3rd Baron Rayleigh', 'Baron Rayleigh III', 'Rayleigh III', and 'Charles Rayleigh, 3rd Baron Rayleigh'. All of these phrases have the same meaning and refer to the same individual, but they provide a range of options for writers who wish to avoid repetition or use a more informal or abbreviated form of the title. Regardless of the terminology used, the importance of the Third Baron Rayleigh's contributions to science and society remains significant and noteworthy.