Here's why:
* Vowel pair: A vowel pair consists of two vowels next to each other, like "ea" in "bread" or "ai" in "rain". "Soaks" only has one vowel, "o".
* Digraph: A digraph is two letters that represent one sound. Examples include "sh" in "ship" or "th" in "think". There are no digraphs in "soaks".
"Soaks" is a simple word with a single vowel sound.