* Blood - This word has the "oo" combination, but it's pronounced with a short "o" sound.
* Flood - Similar to "blood", the "oo" here makes a short "o" sound.
* Wool - The "oo" in this word also sounds like a short "o".
It's worth noting that the "oo" combination typically produces a long "oo" sound (like in "moon" or "food"). So, these words with "oo" sounding like "o" are a bit of an exception to the rule.