First-class and Five-star

First-class adjective - Of the very best kind.

Five-star is a synonym for first-class in best topic. In some cases you can use "Five-star" instead an adjective phrase "First-class", when it comes to topics like superior.

Five-star adjective - Of the very best kind.

First-class is a synonym for five-star in best topic. You can use "First-class" instead an adjective phrase "Five-star", if it concerns topics such as fine, better, top, superior.