83 entries under noun topic. ×

4
duct(course, means, race, beam)
4
excavation
4
ferry
4
ford
4
funnel(opening, conduit)
4
gully(opening, conduit)
4
passageway(opening, channel)
4
quarry(verb, turn, produce, clean)
4
trough
4
warren
3
chimney(opening, beam, rod, duct)
3
drift
3
earth(hole, warren)
3
flue(opening, beam, rod, duct)
3
hovel(nature, break, cut, crack)
3
pole(beam, shaft, rod)
3
stick(opening, shaft)
3
trench
2
aperture
2
bar(beam, shaft, rod)
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APASmart Define. (2015). tunnel thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/tunnel/thesaurus/synonyms
ChicagoSmart Define. 2015. "tunnel thesaurus" https://smartdefine.org/tunnel/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, tunnel thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/tunnel/thesaurus/synonyms>.
MLASmart Define. "tunnel thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/tunnel/thesaurus/synonyms>