| turnout | |
| underground | |
| upper class(noun, expression, quality, society, best) | |
| upper crust(noun, expression, quality, society, best) | |
| wireline(noun, technology, communication, device, telephone) | |
| affluent(adjective, rich, thriving, successful) | |
| aorta | |
| artery | |
| avenue | |
| blooming(adjective, rich, thriving, successful) | |
| booming(adjective, rich, thriving, successful) | |
| boulevard | |
| canal | |
| channel | |
| chosen(noun, best, elect, cream) | |
| comfortable(adjective, rich, thriving, successful) | |
| conduit | |
| corridor | |
| course | |
| cream of the crop(noun, expression, idiom, best, elect) |
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| APA | Smart Define. (2015). main line thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/main_line/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "main line thesaurus" https://smartdefine.org/main_line/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, main line thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/main_line/thesaurus/synonyms>. |
| MLA | Smart Define. "main line thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/main_line/thesaurus/synonyms> |