The phrase "astrological lion" refers to the zodiac sign of Leo. However, there are many synonyms one could use to describe this sign. Some may choose to simply use "Leo" or "Lion" to reference this sun-sign. Other synonyms may include "regal lion," "majestic feline," or "proud lion." Leo is often associated with traits such as confidence, leadership, and creativity, so other synonyms could reflect these qualities as well. For example, one might refer to Leo as a "courageous leader," "inspired artist," or "bold adventurer." Ultimately, the synonym chosen will depend on the context and desired tone of the conversation or written piece.