A four letter word meaning the foundation of something is base.
Ache
Jackass
dumb
taxi
The four letter word that means, "I forbid," is veto.veto
The four letter word is dawn.
A four letter word that means winner can be hero, but it does not exactly mean winner.
fern
Exit
Ashy is a four-letter adjective that means covered in ash or ash-colored. Soot, dust, or slag are four-letter nouns meaning ash.
A four letter word meaning the foundation of something is base.
Kiss.
huge
Ache
anti
stun