niche

(noun) a position particularly well suited to the person who occupies it. Example: "He found his niche in the academic world."

(noun) a small concavity. Synonyms: recess, recession, corner.

(noun) an enclosure that is set back or indented. Synonyms: recess.

(noun) (ecology) the status of an organism within its environment and community (affecting its survival as a species). Synonyms: ecological niche.