"Carz" is a slang term that is used to refer to cars or automobiles. There are several synonyms for this word that are commonly used, depending on the context and the speaker's preference. Some of the most common alternatives to "carz" include "automobiles," "vehicles," "rides," "wheels," "autos," "machines," "motors," "carriages," "coupes," "sedans," "convertibles," "trucks," "motorcycles," and "buses." These synonyms can be used interchangeably to refer to cars in different situations, depending on the tone, context, and specific meaning that the speaker wants to convey.