Gills
Mouths
Mutual synonyms
Both words in one sentence
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Bizarre Alien Biology: The Old Ones apparently had gills, lungs, tentacles, wings, and numerous mouths, among other things.
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Tube worms that live around hydrothermal vents have no mouths, subsisting on nutrients generated by the symbiotic bacteria in their gills.
Source: No Mouth -
Deep-sea tubeworms, which live off nutrients generated chemosynthetically by bacteria in their gills, lost their mouths because they no longer needed to ingest food.
Source: Wipe That Smile Off Your Face
Cite this Source
Mouths and Gills. (2016). Retrieved 2026, July 31, from https://thesaurus.plus/related/gills/mouths
Gills & Mouths. N.p., 2016. Web. 31 Jul. 2026. <https://thesaurus.plus/related/gills/mouths>.
Mouths or Gills. 2016. Accessed July 31, 2026. https://thesaurus.plus/related/gills/mouths.
Google Ngram Viewer shows how "gills" and "mouths" have occurred on timeline