Radicals that allow kanji to have same reading
I've read that there are seven radicals (?) that, when are in either all or most kanji, that they will all share the same on-Yomi as the radical.
工星奂 are three so far, I don't know the other four
工 (“craft”). It is pronounced kou (こう) and all are pronounced kou:
All are read as 'kou'
What are the four other radicals (or more, if any?) will they all have the same reading, or just some kanji?
Many thanks in advance