44 entries under noun topic. ×

12
tube(line, track, underground, railway)
11
subway(line, track, underground, railway)
11
underground(subway, subversives)
3
railroad(line, track, network, reticulation)
3
rail line(expression, line, track, railway)
3
railway(line, track, subway)
3
subway system
2
elevated railway(expression, line, track, railway)
2
line(track, railway, subway)
2
monorail(line, track, network, railway)
2
rail(line, track)
2
streetcar line(expression, line, track, railway)
2
track
2
trolley line(expression, line, track, railway)
1
hose
1
resistance
1
tracks(line, track, network, railway)
1
train line(expression, line, track, railway)
1
tubing
1
underground railroad(expression, idiom)
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APASmart Define. (2015). metro thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/metro/thesaurus/synonyms
ChicagoSmart Define. 2015. "metro thesaurus" https://smartdefine.org/metro/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, metro thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/metro/thesaurus/synonyms>.
MLASmart Define. "metro thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/metro/thesaurus/synonyms>