First class and Illustrious

First class noun - Mail that includes letters and postcards and packages sealed against inspection.

Illustrious and first class are semantically related. in impressive topic. In some cases you can use "Illustrious" instead an adjective phrase "First class", when it comes to topics like eminent, grand, high-ranking.

Illustrious adjective - Standing above others in rank, importance, or achievement.

First class and illustrious are semantically related. Sometimes you can replace phrase "First class" with "Illustrious", this terms are similar.

Nearby Word: illustration