Non-Effect Monster
Non-Effect Monsters are monster cards without an effect. These include any monsters without an effect, including Fusion and Synchro monsters.
Normal Monsters are a type of non-Effect Monster, but not all non-Effect monsters are Normal Monsters. For example, "Gaia Knight, the Force of Earth" is a non-Effect monster but it is not a Normal monster so cards like "Natural Tune" cannot be used on it.
Cards which can affect non-Effect monster include "Non-Spellcasting Area", "Backup Soldier" and "White Elephant's Gift".