30 entries under opening topic. ×

15
pipe(noun, thing, course, drain)
11
channel(noun, line, water, way, course)
8
shaft(noun, thing, hole, channel)
6
tunnel(noun, conduit, passageway, hose)
5
canal(noun, line, way, drain)
5
funnel(conduit, airpipe)
4
main(noun, course, drain, means)
4
passage(noun, line, way, course)
3
flue(noun, pipe, airpipe)
3
gully
3
tap
3
tubule
3
water pipe(expression, idiom, conduit)
2
adjutage
2
passageway
2
path
2
smokestack
2
thoroughfare
2
vessel(noun, channel, cylinder, pipe)
1
chimney
<12>
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APASmart Define. (2015). tube thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/tube/thesaurus/synonyms
ChicagoSmart Define. 2015. "tube thesaurus" https://smartdefine.org/tube/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, tube thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/tube/thesaurus/synonyms>.
MLASmart Define. "tube thesaurus" 5 June 2015. Web. 20 September 2026. <https://smartdefine.org/tube/thesaurus/synonyms>