shadow

As nouns the difference between defacto and shadow

is that defacto is while shadow is a dark image projected onto a surface where light (or other radiation) is blocked by the shade of an object.

As a verb shadow is

to block light or radio transmission.

As nouns the difference between contour and shadow

is that contour is an outline, boundary or border, usually of curved shape while shadow is a dark image projected onto a surface where light (or other radiation) is blocked by the shade of an object.

As a verb shadow is

to block light or radio transmission.

As nouns the difference between shadow and ellipse

is that shadow is a dark image projected onto a surface where light (or other radiation) is blocked by the shade of an object while ellipse is ellipse.

As a verb shadow

is to block light or radio transmission.

As a noun shadow

is a dark image projected onto a surface where light (or other radiation) is blocked by the shade of an object.

As a verb shadow

is to block light or radio transmission.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between shadow and substance

is that shadow is a dark image projected onto a surface where light (or other radiation) is blocked by the shade of an object while substance is physical matter; material.

As a verb shadow

is to block light or radio transmission.

As nouns the difference between shadow and echo

is that shadow is a dark image projected onto a surface where light (or other radiation) is blocked by the shade of an object while echo is echo (a reflected sound that is heard again by its initial observer).

As a verb shadow

is to block light or radio transmission.