Since only a moderator can make ski a synonym of winter-sports and only people with enough "tag score" can nominate and vote towards it becoming a synonym, there's nothing I can do but report it here.
I am also not opposed to breaking out the synonym skiing into its own tag now that the site has grown so much and either making ski a synonym of that or just burninating it. But this also requires moderator action.
* "Ski" actually is correct English of course for questions asking about a single ski rather than a more usual pair, about ordering somebody to ski, etc. But not make good tag.