Chain lightning and Heat lightning

Chain lightning noun - A form of lightning that moves rapidly in a zigzag path with one end divided (fork-like).

Heat lightning and chain lightning are semantically related. In some cases you can replace phrase "Heat lightning" with "Chain lightning", this phrases are similar.

Heat lightning noun - Bright flashes of light near the horizon without thunder (especially on hot evenings); usually attributed to distant lightning that is reflected by clouds.

Chain lightning and heat lightning are semantically related. Sometimes you can replace phrase "Chain lightning" with "Heat lightning", this phrases are similar.