An excerpt from my most recent proofreading book on teaching vocabulary:
“… the root struct … occurs in well over 300 words in English! Now let’s look at the root hydr…. This root occurs in almost 500 words in English — more than three times as many words as struct.”
Uh. I asked for verification on those data.
Magrilless 
Well it could be true depending on how you count such words as hydrostructure and lack of words like structirhydrapanic.