If you've accidently typed "fgss" instead of the intended word, there are a few possibilities for what you meant. Maybe it was meant to be "guess", "foggy", "forgo" or "fragile". Double-check the context and choose the correction that fits best.
FESS The surgeon will use the FESS technique to remove the nasal polyps.
FG SS
FGAS
FOSSFOSS or Free and Open Source Software is a popular choice for developers who want to create applications without any restrictions and ensure that their work remains accessible to everyone.