178 entries under noun topic. ×

15
pipe(thing, course, opening, drain)
15
subway(line, thing, track, hole)
13
hose(thing, cylinder, conduit, pipe)
12
conduit(line, thing, way, drain)
11
channel(line, water, way, course)
11
underground
10
metro(line, track, underground, railway)
9
line(thing, way, track, trail)
8
duct(line, way, course, drain)
8
shaft(thing, opening, hole, channel)
6
cylinder(container, holder, reel, pipe)
6
television(visual, electricity)
6
tunnel(opening, conduit, passageway, hose)
6
vacuum tube(expression, idiom)
5
tubing
5
canal(line, way, opening, drain)
5
pipeline(channel, passage, cylinder, pipe)
5
roll(wave, breaker, whitecap)
5
valve
4
catheter
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APASmart Define. (2015). tube thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/tube/thesaurus/synonyms
ChicagoSmart Define. 2015. "tube thesaurus" https://smartdefine.org/tube/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, tube thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/tube/thesaurus/synonyms>.
MLASmart Define. "tube thesaurus" 5 June 2015. Web. 30 September 2026. <https://smartdefine.org/tube/thesaurus/synonyms>