Why we say fluorine oxide instead …

While both Oxygen and Chlorine are chemically-active, they cannot form compounds with the inert gasses, while Fluorine is the most chemically-active of all the elements. Elements grouped together on the periodic table have similar electron configurations and therefore similar chemical properties and reactivity.

Oxygen fluorides are compounds of elements oxygen and fluorine with the general formula OnF2, where n = 1 to 6. Many different oxygen fluorides are known:

oxygen difluoride (OF2)
dioxygen difluoride (O2F2)
trioxygen difluoride or ozone difluoride (O3F2)[1][2]
tetraoxygen difluoride (O4F2)[3]
pentaoxygen difluoride (O5F2)
hexaoxygen difluoride (O6F2)[4]
dioxygen monofluoride(O2F)

tetraoxygen difluoride
Oxygen fluorides are strong oxidizing agents with high energy and can release their energy either instantaneously or at a controlled rate. Thus, these compounds attracted much attention as potential fuels in jet propulsion systems.