Both of the titles look very similar in UI appearance to the Android and iOS applications, the Zynga style of doing things has over-ruled the Windows 8 Design Language that gives Windows Phone the distinctive look. That's going to be overlooked by a lot of people as they'll finally be able to take their games on the move with their Microsoft powered handsets.
Words With Friends feels a lot like multiplayer Scrabble, and joins a competitive environment on Windows Phone with a number of turn by turn word games already available. But the large user base of Zynga's title is likely to overpower Word Feud and Words by Post.
The Pictionary like Draw Something burned very brightly at the start of the year, with millions of players and a stellar valuation when it was purchased by Zynga. It's had a bit of a re-evaluation since then, but is still a popular game online.
You can get your copies of Words with Friends and Draw Something from the Windows Store right now for $2.99, although Nokia Lumia users have the option of a free download as well. We can only assume that Nokia are subsidising the titles to ensure their appearance on the platform.