Rupicolous is a unique and rarely used word that describes plants or animals that grow or live on rocks. Synonyms for "rupicolous" include "petrophytic," which means growing on rocks or cliffs, "lithophilous," which refers to plants that grow in rocky soil, and "saxicolous," which describes organisms that live on rocks or cliffs. Other related words include "escarpment plants," which are plants that thrive in rocky environments, and "crevice-dwelling," which refers to organisms that live within the cracks and crevices of rocks. Overall, these synonyms for "rupicolous" capture the essence of plants and animals that have adapted to survive in harsh rocky landscapes.