We don't have synonyms for nikko yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are nikki, niko and nikky.
(n) :
(Australia, usually Queensland, informal) A felt-tip pen, of the Nikko brand or of any other brand, or the marks left by such a pen.
(n) :
Alternative letter-case form of Nikko. [(Australia, usually Queensland, informal) A felt-tip pen, of the Nikko brand or of any other brand, or the marks left by such a pen.]
(n) :
(Australia, usually Queensland, informal) A felt-tip pen, of the Nikko brand or of any other brand, or the marks left by such a pen.
(n) :
Alternative letter-case form of Nikko. [(Australia, usually Queensland, informal) A felt-tip pen, of the Nikko brand or of any other brand, or the marks left by such a pen.]