I don't say this from any authority, just my impression, but regarding fires, I think in the USA there may be different common usage of terms depending on which side of the Mississippi River. In the East, where we have large tracts of deciduous forest, major fires in forested areas are still mostly referred to as forest fires. Bushfire is not, I think, used anywhere in the USA. Brushfires, at least in the east, refer to fires that occur in meadows, grasslands, or mixed scrub areas with many bushes, scrub pines and saplings but is by no means forest. Forest fires may start as brush fires that spread into forests and become forest fires. Wildfire may be applied to any fire that is out of control, but in the East, most major fires that burn out of control are going to be in deciduous woods so will more likely be called forest fires. Fires in coastsl pine forests and swamps might be more likely to be called wildfires instead of forest fires.

Out west, my impression is fires are more likely to be called wildfires regardless of topography or fauna. It's higher and drier out there, with natural scrub lands, and extensive pine/evergreen forests but fewer deciduous forests. Fires on the great expanse of prairie between the Mississippi and the foothills of the Rockies, to the extent large expanses of prairie still exist, vs. cultivated land, are called prairie fires.