Backache and Niggle

Backache noun - An ache localized in the back.

Niggle and backache are semantically related. In some cases you can use "Niggle" instead a noun "Backache".

Niggle verb - To make often peevish criticisms or objections about matters that are minor, unimportant, or irrelevant.

Backache and niggle are semantically related. Sometimes you can use "Backache" instead a noun "Niggle".