Octal is a numerical base system that is widely used in computing and electronics. But, if you are looking for some synonyms for the word 'octal,' then you might consider using the term 'base 8.' Other possible synonyms for the word 'octal' include octonary, which is derived from Latin, or octadecimal, which means base 18. Additionally, you might also use the term 'base 8 encoding' or 'octal encoding' to refer to the octal numeric system. Regardless of the term you choose, it's important to remember that octal is an important mathematical system that is widely used today, especially in binary coding and computer programming languages.