Aldehyde
If a -CHO group is attached to a ring, then -carbaldehyde is added to the end of the name. Because of this, C6H11CHO is known as cyclohexanecarbaldehyde.  If there are other names that need to be added to the end of the word because other functional groups are present, formyl- is added to the beginning of the word. Methanoyl-is sometimes added instead, but formyl- is better.