Underground openings
Underground workings and underground openings are semantically related. In some cases you can replace phrase "Underground workings" with "Underground openings", this phrases are similar.
Underground workings
Underground openings and underground workings are semantically related. Sometimes you can replace phrase "Underground openings" with "Underground workings", this phrases are similar.
Mutual synonyms
Cite this Source
Underground workings and Underground openings. (2017). Retrieved 2026, August 01, from https://thesaurus.plus/related/underground_openings/underground_workings
Underground openings & Underground workings. N.p., 2017. Web. 01 Aug. 2026. <https://thesaurus.plus/related/underground_openings/underground_workings>.
Underground workings or Underground openings. 2017. Accessed August 01, 2026. https://thesaurus.plus/related/underground_openings/underground_workings.
Google Ngram Viewer shows how "underground openings" and "underground workings" have occurred on timeline