Immediacies is a word that is not frequently used in everyday language. However, there are several synonyms that can be used in its place. The word urgency can be used to mean the same thing as immediacies, as it conveys a sense of importance and the need for immediate attention. Another synonym for immediacies is promptness, which refers to the quality of being quick to respond or act. Other synonyms for immediacies include instantaneity, immediateness, and swiftness. Each of these words conveys a sense of urgency and importance that is similar to the meaning of immediacies.