Your trolling aside:
- Gravel bikes: Agressive geometry (Cyclocross) to leausure geometry (Randonneur), no fenders, knobble tyres, lightness before sturdiness
- Touring bikes: Flat handle bar, leasure geometry (same as Randonneur), but often paired with a suspension fork. More focused at casuals.
- Randonneur: Relaxed geometry (longer wheel base), racing bike handle bar, more sturdy but heavier than gravel bikes, all retain tyres