As nouns the difference between coordinate and complement
is that
coordinate is a number representing the position of a point along a line, arc, or similar one-dimensional figure while
complement is something (or someone) that completes; the consummation.
As verbs the difference between coordinate and complement
is that
coordinate is to synchronize (activities) while
complement is to complete, to bring to perfection, to make whole.
As an adjective coordinate
is of the same rank; equal.