Not travelling in the active, edgy world where -- at most -- only lip service is given to the notion of 'taste', one may come up halt against the nuance of type.
Let's attempt to discern? 'Slattern' refers to a woman degenerate in habits, perhaps aging before her years, of limited, low pleasures. 'Slut' points more directly to sexual activity, a woman willing to give herself often and boldly, finding excitement in the forbidden amount and pitch of desire. Near that, we find 'skank', a blend of sexual looseness and cheap taste.