equator

As a proper noun equator

is the earth’s equator.

As a noun palaeoequator is

the equator as it was in geologic time.

As nouns the difference between equator and midlatitude

is that equator is an imaginary great circle around the Earth, equidistant from the two poles, and dividing earth's surface into the northern and southern hemisphere while midlatitude is any latitude roughly half way between the equator and a pole.

As a proper noun Equator

is the Earth’s equator.

As an adjective midlatitude is

of or relating to the midlatitudes or phenomena located there.