What is another word for ' high roller '?. What's another word for ' high roller '? Here's a list of synonyms for this word. Noun. bettor · high-stakes gambler. Define high roller (noun) and get synonyms. What is high roller (noun)? high roller (noun) meaning, pronunciation and more by Macmillan Dictionary. big spender high roller synonyms, antonyms, English dictionary, English language, definition, see also 'spend',slender',speed',spendthrift', Reverso dictionary.