As the crow flies and Straight line

As the crow flies adverb - By the shortest and most direct route.

Straight line and as the crow flies are semantically related. in shortest most direct route topic. In some cases you can use "Straight line" instead an adverb phrase "As the crow flies".

Straight line noun - A line traced by a point traveling in a constant direction; a line of zero curvature.

As the crow flies and straight line are semantically related. You can use "As the crow flies" instead an adverb phrase "Straight line".