At and Over

At noun - A highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium.

Over and at are semantically related. In some cases you can use "Over" instead the word "At" as an adverb or a preposition.

Over adjective - Brought or having come to an end.

At and over are semantically related. Sometimes you can use "At" instead the word "Over" as an adverb or a preposition.