What has a higher frequency than the fundamental frequency?

The fundamental = 1st harmonic is not an overtone!
Fundamental frequency = 1st harmonic.

The following tones have a higher frequency:

2nd harmonic = 1st overtone.
3rd harmonic = 2nd overtone.
4th harmonic = 3rd overtone.
5th harmonic = 4th overtone.
6th harmonic = 5th overtone.

Look at the link: "Calculations of Harmonics from Fundamental Frequency".