I've used the word 'salve' in one writing I've made. One of the readers objects that the word 'salve' is 'a substance we use for healing a wound' thus it can't be used here. My sentence was:
Supplication is a salve for every sore.
Although when I used it, the thing I had in my mind was that here the word 'salve' is in a 'figurative' sense. I need to have some inputs from the contributors on this with some examples.