Words with 'shw' at the start and 'a' at the end

How many acceptable words are possible to put together using words that start with 'shw' and end with 'a'?
Unluckily you can pick from only 1 entry addressing your query.

What's the highest number of points you're able to get in Scrabble from this list of words beginning with 'shw' and ending with 'a'?
As there is only 1 result to choose from, you are obligated to use 'shwa' which totals 10 points.