The correct spelling of the word "Narcotan" is [nɑːkəʊtæn]. This word is a combination of two words, "narcotic" and "tan," which means to change the color or texture of something. It is used to describe a substance that alters the color or texture of narcotics, making them more difficult to identify. The spelling follows English phonetic rules, with "narco-" pronounced as "nahr-ko" and "-tan" as "tæn." Remembering the correct spelling of "Narcotan" is essential in fields that deal with drug identification and analysis.