Accha is a Hindi word used to express agreement, approval, or acknowledgment. There are several synonyms for this word in English, such as 'good', 'great', 'excellent', 'fine', 'okay', 'alright', 'fantastic', 'superb', 'awesome', 'amazing', 'fabulous', 'splendid', and 'phenomenal'. All these words imply positivity, satisfaction, or appreciation, just like accha does in Hindi. Depending on the context, one may prefer using a particular synonym over the other to convey a specific tone or emotion. However, all these words are interchangeable and can be used in place of accha to express positivity and appreciation.