cohabitant

/koʊˈhæbɪtənt/
noun
  1. A person who lives with another person, especially as a romantic partner without being married.
    • As a cohabitant, he contributed equally to the household expenses.
    • The lease allows each cohabitant to have a guest for up to two weeks.
    • Her cohabitant helped her care for the garden.
  2. An organism that lives in the same place as another, often of a different species.
    • Certain bacteria are natural cohabitants of the human gut.
    • The barn owl is a common cohabitant of old farm buildings.
    • The reef is home to many cohabitants, including fish and coral.
Antonyms
What does "cohabitant" mean? | whatsthatwordmean | whatsthatwordmean