[NaYa]

I wish there was a sticky thread focusing on the kanji with different pronunciations for the same character depending on the usage. It often confuses me as to how to read certain kanji combinations because of that... there are so many different rules for them! >_<

For example: 収穫祭
Is it read as Shuukaku sai or Shuukaku matsuri? What is the difference between the two?