Strength is a related term of coaction.
In obsolete|lang=en terms the difference between strength and coaction
is that
strength is (obsolete) to give strength to; to strengthen while
coaction is (obsolete) force; compulsion, either in restraining or impelling.
As nouns the difference between strength and coaction
is that
strength is the quality or degree of being strong while
coaction is (obsolete) force; compulsion, either in restraining or impelling or
coaction can be (mathematics).
As a verb strength
is (obsolete) to give strength to; to strengthen.