30 entries under opening topic. ×

4
pipe
4
tube
3
funnel
3
tap
2
canal
2
channel
2
fistula
2
gully
2
gut
2
passageway
1
chimney
1
flue
1
gallery
1
main
1
mine
1
passage
1
path
1
pit
1
shaft
1
smokestack
<12>
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APASmart Define. (2015). tubule thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/tubule/thesaurus/synonyms
ChicagoSmart Define. 2015. "tubule thesaurus" https://smartdefine.org/tubule/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, tubule thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/tubule/thesaurus/synonyms>.
MLASmart Define. "tubule thesaurus" 10 April 2015. Web. 30 September 2026. <https://smartdefine.org/tubule/thesaurus/synonyms>