F Suspended 4th (Fsus4)
1+4+5
Notes in F Suspended 4th
F (root)BbC
Inversions
Same notes as F Suspended 4th, with a different chord tone as the lowest note. Useful for smoother movement between chords instead of jumping around the keyboard.
Root position
F in the bass
1st inversion
Bb in the bass
2nd inversion
C in the bass
F Suspended 4th is built from F, Bb and C.
The other suspension raises the missing third up to a perfect fourth, which sits a half step above where the third would normally be. That closeness creates real tension, and it's why a sus4 chord so often falls straight back down into the plain major or minor triad on the same root a beat later.