Cases of word usage

1) the fatty or oily part of milk which rises to the surface and can be made into butter (cream)

2) an oily medicine used for rubbing on a bruise etc (embrocation)

3) (a kind of) oily medicinal substance, used on wounds, sores or burns; to calm (one's conscience) (salve)

4) to mark (something) with something oily or sticky; spread (something oily etc) on (something); a deliberate (often untrue) remark made against a person, product, business etc (smear)