Hollow
Hollow noun - A sunken area forming a separate space.
Usage example: made a little hollow in her mound of mashed potatoes and filled it with gravy
Opening and hollow are semantically related in nature topic. In some cases you can use "Opening" instead a noun "Hollow", when it comes to topics like niche.
How words are described
Both words in one sentence
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It's also defied in the opening montage at the academy, as the instructor details for his cadets the effects that their hollow point ammunition would have on a human skull.
Source: Film / The Departed -
Played wonderfully straight in the opening scene of Sleepy Hollow (1999), where we see the Hessian who later becomes the Headless Horseman escaping through the woods from Revolutionary War soldiers.
Source: So Much for Stealth - In Hollow Places, both the opening and closing paragraphs state the normality is hard to define.
Source: Book Ends / Literature
Cite this Source
Opening and Hollow. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/hollow/opening
Hollow & Opening. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/hollow/opening>.
Opening or Hollow. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/hollow/opening.
Google Ngram Viewer shows how "hollow" and "opening" have occurred on timeline