- nicheA cavity, hollow, or recess, generally within the thickness of a wall, for a statue, bust, or other erect ornament.
- nyeA surname from Middle English.
- nideA nest of pheasants.
- nidusAn aggregate of neurons.
- nidationThe implantation of the early embryo in the uterus.
- nidicolousTending to stay at the nest or birthplace for a long time after birth, due to dependence on the parents for feeding and protection.
- nidifugousThat leaves the nest shortly after hatching.
- nido-a nest-like structure
- nidologyThe study of nests.