There are three styles of Greek column. Ionic and Doric both have five letters. (Corinthian is too long.)
Rock is a four letter word for a stone
Four letter word for stone is "Rock".
sill
One option is stone.
stone
Stone
Ruby
Edifice is a 7 letter word for building.
The word is jewel. It is defined as a precious stone.
stone
stone
Stone
the answer is........ stone!!