The word "umbellula" may seem like a tricky word to spell, but with the help of the International Phonetic Alphabet (IPA), it becomes clearer. The spelling is based on the sound of the word, which is /ʌmˈbɛljələ/. The first syllable is pronounced as "um" (/ʌm/), followed by "bell" (/ˈbɛl/) with emphasis on the second syllable, and ending with "ula" (/ələ/). This word refers to a type of sea urchin that has a spherical shape with long spines, and is commonly found in the Pacific Ocean.