First class
First class noun - Mail that includes letters and postcards and packages sealed against inspection.
Heavy
Heavy adjective - Having great weight.
First class and heavy are semantically related. Sometimes you can replace phrase "First class" with "Heavy", this terms are similar.
Mutual synonyms
Both terms in one sentence
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In the comics, Sebastian Shaw is a thuggish-looking, middle-aged businessman◊ with a heavy build best described as "gorilla-like." In X-Men: First Class, he's played by a suave Kevin Bacon.
Source: Adaptational Attractiveness -
In Net's suitcase, Manfred.Felix, Net & Nika is a series of Young Adult books by Polish writer Rafał Kosik, mixing fantasy and science fiction with heavy doses of Polish school.It's the beginning of the new schoolyear and, for Felix Polon, the beginning of new school - first class of Gymnasium.
Source: Literature / Feliks, Net & Nika
Cite this Source
Heavy and First class. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/first_class/heavy
First class & Heavy. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/first_class/heavy>.
Heavy or First class. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/first_class/heavy.
Google Ngram Viewer shows how "first class" and "heavy" have occurred on timeline