Calciferous is a term that refers to something that contains or is rich in calcium. There are several synonyms that can be used interchangeably with calciferous. One of these is calcariferous, which refers to soils or strata that contain calcium carbonate. Another common synonym is calcareous, which also refers to substances containing high amounts of calcium carbonate. Other synonyms include lime-rich, chalky, and limestone. These terms can be used in a variety of contexts, including geology, agriculture, and horticulture, to describe a range of materials that contain significant amounts of calcium. By using these synonyms, writers and speakers can add variety and nuance to their vocabulary.