"niches" in the noun sense

1. niche

a position particularly well suited to the person who occupies it

"he found his niche in the academic world"

2. recess, recession, niche, corner

a small concavity

3. recess, niche

an enclosure that is set back or indented

4. niche, ecological niche

ecology) the status of an organism within its environment and community (affecting its survival as a species)

Source: WordNet® (An amazing lexical database of English)

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