1) clay, potter's earth
2) anything made of clay, earthen ware
3) a roofing tile
3a) the roof itself
3b) the phrase "through the roof", means through the door in the roof to which a ladder or stairway led up from the street (according to the Rabbis distinguish two ways of entering a house, "the way through the door" and "the way through the roof"
For Synonyms see entry G5858