LOVE..........
alcohol
a river barge will generally be flat bottomed, so that it can go up rivers
A flat-bottomed flask is commonly used in chemistry laboratories to hold liquids or chemical reactions. Its flat bottom design allows for stability on a flat surface, preventing tipping over during experiments or when placed on a heat source like a hot plate.
Sunfish
ferryboat
nothing
They may be used to mix chemicals and observe them with the added advantage they can be placed and be stable on flat surfaces such as hotplates, benches, fridge shelves and ovens etc.
any of various flat-bottomed boats with sloping ends
Flat bottomed flask is used to hold different types of chemicals and mix them. This also used to avoid liquid from spilling.
A flat boat is a flat-bottomed boat used to float goods and passengers downriver.
A gondola.
Flatboat