flat
A four letter word meaning the foundation of something is base.
temp
crow
Jackass
Four-letter word for flat-topped plateau is "mesa". which is Spanish for "table". Mesa tyiuyfgyiopoiuyttyuiop[poiuytrtyuiop[][poiuy
Table ...
A mesa has a flat top.
'Flat' is one...
flat
The four letter word that means, "I forbid," is veto.veto
The four letter word is dawn.
Dory
plat
Flat, even.
flat
Mesa would be one