3
feeder(noun, animals eat out of it)
3
follicle
3
glen(noun, gorge, vale)
3
indentation(noun, depression, dip, hollow, bottom)
3
lacuna
3
passage(noun, course, means, race, flow)
3
score(noun, depression, hollow, scrape, indentation)
3
shaft(noun, mine, pit, quarry, tube)
3
sinus
3
spout(noun, drain, flow, channel, passage)
3
watercourse(noun, depression, drain, flow, channel)
2
out of phase(expression, idiom)
2
pipe(noun, course, drain, means, route)
2
air
2
arena
2
artery
2
billow
2
blight(decline, low, collapse, failure, depression)
2
bottom(decline, low, collapse, failure, depression)
2
bowlful
11 years ago|12k views|share |citing 
APASmart Define. (2015). trough thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/trough/thesaurus/synonyms
ChicagoSmart Define. 2015. "trough thesaurus" https://smartdefine.org/trough/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, trough thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/trough/thesaurus/synonyms>.
MLASmart Define. "trough thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/trough/thesaurus/synonyms>