Errand and Head ache

Errand noun - A short trip that is taken in the performance of a necessary task or mission.

Head ache and errand are semantically related In some cases you can replace phrase "Head ache" with "Errand", this terms are similar.

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

Errand and head ache are semantically related in job or chore topic. Sometimes you can use "Errand" instead a noun phrase "Head ache".