The musicals refer to a staging of performances, which include singing, dancing, and dialogue to depict a story, while an opera has to do with the use of classical music to sing a story. The musical seems a little bit wider than opera. The musical can be done in your own preferred language, depending most likely on the audience. For example, the United States and the United Kingdom use the English language for their musical presentations. However, opera has to be done in a specific native way.
There are several opera styles in different languages, such as Italian opera, Russian opera, English language opera, French opera, and German-language opera. Every one of these languages has its own different styles of performance. The performers of musicals are trained to dance and to express their presentation with emotions. On the other hand, opera performers are well trained to sing, and they do less dancing, but sometimes accompanied by the libretto.