The term 'Cause of a Buzz' can be solved by the crossword solutions BEE and FLY, both of which are three letter words. Bees and flies are both insects that are known for their buzzing sound, which is created by their wings vibrating rapidly. Bees are important pollinators and are found in many ecosystems, while flies are considered pests due to their ability to spread disease. Both bees and flies are capable of creating a buzzing sound, making them the cause of a buzz.