We don't have synonyms for nonrhotic yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are non-rhotic, nonerotic and nonexotic.
(adj) :
Alternative form of non-rhotic. [Of an accent, most often one of English: not pronouncing the written letter "r" unless it is followed by a vowel, as in Received Pronunciation, most other accents of England, the Boston accent, traditional NYC English, many accents of southern Louisiana, Australian English, etc.]
(adj) :
Alternative form of non-rhotic. [Of an accent, most often one of English: not pronouncing the written letter "r" unless it is followed by a vowel, as in Received Pronunciation, most other accents of England, the Boston accent, traditional NYC English, many accents of southern Louisiana, Australian English, etc.]