Drills
Trial balloons and drills are semantically related. In some cases you can use "Trial balloons" instead a noun "Drills".
Trial balloons
Drills and trial balloons are semantically related. Sometimes you can use "Drills" instead a noun phrase "Trial balloons".
Cite this Source
Trial balloons and Drills. (2016). Retrieved 2026, July 31, from https://thesaurus.plus/related/drills/trial_balloons
Drills & Trial balloons. N.p., 2016. Web. 31 Jul. 2026. <https://thesaurus.plus/related/drills/trial_balloons>.
Trial balloons or Drills. 2016. Accessed July 31, 2026. https://thesaurus.plus/related/drills/trial_balloons.
Google Ngram Viewer shows how "drills" and "trial balloons" have occurred on timeline