The term 'word in the etymology of 'ASSASSIN'' is referring to the word 'HASHISH', which is a seven letter word. HASHISH is a drug derived from the cannabis plant, and it has been used for centuries in Middle Eastern cultures. The term 'ASSASSIN' is believed to have originated from the Arabic word 'hashshashin', which translates to 'users of HASHISH'. This suggests that the term 'ASSASSIN' was originally used to describe someone who was under the influence of HASHISH.