First class
First class noun - Mail that includes letters and postcards and packages sealed against inspection.
Main and first class are semantically related. in prime topic. In some cases you can use "Main" instead an adjective phrase "First class", when it comes to topics like best, highest in importance.
Main
Main adjective - Coming before all others in importance.
First class and main are semantically related. Sometimes you can replace phrase "First class" with "Main", this terms are similar.
Mutual synonyms
Both terms in one sentence
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Changing of the Guard: The previous movies featured Wolverine as the main protagonist, but First Class has Magneto and Professor X as the two lead characters.
Source: Film / X-Men: First Class -
Motoko, the main character, while normally a rather shy girl, has three distinct personalities, whose names start with 1, 2 and 3 (HiFuMi) and are able to use first class fighting skills.
Source: My Hero Zero - In the Fumi Yoshinaga manga Ichigenme... The First Class is Civil Law, main character Tamiya meets love interest Tohdou, who introduces himself with a kiss... but Tamiya is just irritated.
Source: Closet Key
Cite this Source
Main and First class. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/first_class/main
First class & Main. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/first_class/main>.
Main or First class. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/first_class/main.
Google Ngram Viewer shows how "first class" and "main" have occurred on timeline