Nervous strain and Nervousness

Nervous strain noun - (psychology) nervousness resulting from mental stress.

Nervousness and nervous strain are semantically related. In some cases you can use "Nervousness" instead a noun phrase "Nervous strain".

Nervousness noun - An uneasy state of mind usually over the possibility of an anticipated misfortune or trouble.

Nervous strain and nervousness are semantically related. Sometimes you can replace phrase "Nervous strain" with "Nervousness", this terms are similar.