We don't have synonyms for ni-mh yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are no, pi and i.
(n) :
(UK) Initialism of Northern Ireland. [A constituent country and province of the United Kingdom, situated in the northeastern part of the island of Ireland.]
(n) :
(UK, finance) Acronym of national insurance. [(UK, Ireland) A system of taxes paid by workers and employers, used primarily to fund state benefits.]
(n) :
(UK) Initialism of Northern Ireland. [A constituent country and province of the United Kingdom, situated in the northeastern part of the island of Ireland.]
(n) :
(UK, finance) Acronym of national insurance. [(UK, Ireland) A system of taxes paid by workers and employers, used primarily to fund state benefits.]