A sponge learner refers to an individual with an insatiable thirst for knowledge and a natural ability to absorb information effortlessly. Synonyms for a sponge learner include avid learner, knowledge enthusiast, information sponge, voracious reader, and eager absorber. Avid learners possess a strong passion for expanding their knowledge in various domains, always seeking out opportunities to gain new insights and facts. Knowledge enthusiasts tirelessly pursue learning, displaying an unquenchable curiosity. Information sponges have an innate ability to soak up knowledge and retain it effortlessly. Voracious readers have an insatiable appetite for books, devouring information from various written sources. Eager absorbers are individuals who eagerly soak up new information, making the most of every learning opportunity that comes their way.