Effort and Head ache

Effort noun - The active use of energy in producing a result.

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

Nearby Words: effortlessly, effortless, effortful, effortlessness

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

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