First class
First class noun - Mail that includes letters and postcards and packages sealed against inspection.
Leading and first class are semantically related. in prime topic. In some cases you can use "Leading" instead an adjective phrase "First class", when it comes to topics like best, top, eminent, high-ranking.
Leading
Leading adjective - Coming before all others in importance.
First class and leading are semantically related. Sometimes you can use "First class" instead an adjective "Leading".
Mutual synonyms
Both terms in one sentence
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She begins as a sergeant first class, leading a squad, and less than ten minutes after the battle starts ends up in command of her entire company.
Source: You Are in Command Now
Cite this Source
Leading and First class. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/first_class/leading
First class & Leading. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/first_class/leading>.
Leading or First class. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/first_class/leading.
Google Ngram Viewer shows how "first class" and "leading" have occurred on timeline