What is an alliteration in the monkeys paw?

There are several instances of alliteration in The Monkey's Paw, including:

1. "Mr. and Mrs. White" ("w" sound)

2. "three wishes" ("w" sound)

3. "sinister smile" ("s" sound)

4. "cold and clammy" ("c" sound)

5. "white face" ("w" sound)

6. "terrible tragedy" ("t" sound)