Gordian knot and Head ache

Gordian knot noun - An intricate knot tied by Gordius, the king of Phrygia, and cut by the sword of Alexander the Great after he heard that whoever undid it would become ruler of Asia.

Head ache and Gordian knot are semantically related In some cases you can replace phrase "Head ache" with "Gordian knot", this phrases are similar.

Head ache noun - Pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs.

Gordian knot and head ache are semantically related in complicated situation topic. Sometimes you can use "Gordian knot" instead a noun phrase "Head ache".