Nife is a see also of sima.

In context|geology|lang=en terms the difference between nife and sima

is that nife is (geology) nickel–iron, especially the material that makes up the core of the earth while sima is (geology) the lower layer of the earth's outer crust that underlies the sial and is rich in silica, iron, and magnesium.

As nouns the difference between nife and sima

is that nife is (geology) nickel–iron, especially the material that makes up the core of the earth while sima is (architecture) the upturned edge of a roof which acts as a gutter; a cyma or sima can be (geology) the lower layer of the earth's outer crust that underlies the sial and is rich in silica, iron, and magnesium.