| feeder(noun, animals eat out of it) | |
| follicle | |
| glen(noun, gorge, vale) | |
| indentation(noun, depression, dip, hollow, bottom) | |
| lacuna | |
| passage(noun, course, means, race, flow) | |
| score(noun, depression, hollow, scrape, indentation) | |
| shaft(noun, mine, pit, quarry, tube) | |
| sinus | |
| spout(noun, drain, flow, channel, passage) | |
| watercourse(noun, depression, drain, flow, channel) | |
| out of phase(expression, idiom) | |
| pipe(noun, course, drain, means, route) | |
| air | |
| arena | |
| artery | |
| billow | |
| blight(decline, low, collapse, failure, depression) | |
| bottom(decline, low, collapse, failure, depression) | |
| bowlful |
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| APA | Smart Define. (2015). trough thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/trough/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "trough thesaurus" https://smartdefine.org/trough/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, trough thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/trough/thesaurus/synonyms>. |
| MLA | Smart Define. "trough thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/trough/thesaurus/synonyms> |