The word "spongillafly" is a specific term referring to a type of insect that is known for its association with freshwater sponges. However, if you're looking for synonyms for this term, one could describe the insect as a spongefly or a freshwater sponge moth. Another option could be to use the insect's scientific name, Sisyra dalii. These synonyms provide alternatives to the term "spongillafly" while still conveying the insect's unique characteristics and habitat. When it comes to writing about scientific topics, having a range of specific vocabulary at hand can help create a clearer and more accurate description of any given subject.