Tunnel network
Underground passage and tunnel network are semantically related. In some cases you can use "Underground passage" instead a noun phrase "Tunnel network".
Underground passage
Tunnel network and underground passage are semantically related. You can use "Tunnel network" instead a noun phrase "Underground passage".
Both terms in one sentence
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Tunnel Network: The castle has more than one secret underground passage.
Cite this Source
Underground passage and Tunnel network. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/tunnel_network/underground_passage
Tunnel network & Underground passage. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/tunnel_network/underground_passage>.
Underground passage or Tunnel network. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/tunnel_network/underground_passage.
Google Ngram Viewer shows how "tunnel network" and "underground passage" have occurred on timeline