As a rule of thumb, I have learned that Onyomi is usually when a kanji is part of a compound word and Kunyomi is usually when the kanji is by itself. Yes, I ty

As a rule of thumb, I have learned that Onyomi is usually when a kanji is part of a compound word and Kunyomi is usually when the kanji is by itself. Yes, I typoed that and it's too late to fix it. り is "ri", not "ru".