First class
First class noun - Mail that includes letters and postcards and packages sealed against inspection.
Upper and first class are semantically related. in best topic. In some cases you can use "Upper" instead an adjective phrase "First class", when it comes to topics like top.
Upper
Upper adjective - Higher in place or position.
First class and upper are semantically related. Sometimes you can use "First class" instead an adjective "Upper".
Both terms in one sentence
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British university degrees are awarded with one of the following honours classifications: first class, upper second, lower second, third, and ordinary.
Source: Rank Inflation -
First class passengers are seen dancing the tango when in fact there was no dancing for first class passengers on Titanic and the tango was not even embraced by the upper classes until a few years later.
Source: Series / Titanic (1996) -
X-Men: First Class affirms that he's half-British through his mother, and she had raised him to behave and speak like a proper upper-class English gentleman.
Source: Film / X-Men Film Series
Cite this Source
Upper and First class. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/first_class/upper
First class & Upper. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/first_class/upper>.
Upper or First class. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/first_class/upper.
Google Ngram Viewer shows how "first class" and "upper" have occurred on timeline