First class
First class noun - Mail that includes letters and postcards and packages sealed against inspection.
High and first class are semantically related. in superior topic. In some cases you can use "High" instead an adjective phrase "First class", when it comes to topics like excellent.
High
High adjective - Extending to a great distance upward.
First class and high are semantically related. Sometimes you can replace phrase "First class" with "High", this terms are similar.
Nearby Word: highly
Mutual synonyms
Both terms in one sentence
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High School Boys and the New Semester: The boys spent the whole skit discussing the winter break while waiting for the first class of the spring term.
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Not to mention she pays for a first class flight, a helicopter ride, a full spa treatment, a new high-fashion wardrobe, and more.
Source: Film / Last Holiday - First Class' 1974 hit "Beach Baby" is a peppy, bouncy tune about a man reminiscing with his high-school girlfriend, only to find out in the last verse that "I guess you don't remember anything."
Source: Lyrical Dissonance / Pop
Cite this Source
High and First class. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/first_class/high
First class & High. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/first_class/high>.
High or First class. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/first_class/high.
Google Ngram Viewer shows how "first class" and "high" have occurred on timeline