The spelling of the word "Cuckoobud" can be tricky as it involves some irregularities. The first "o" in the word is pronounced as "uh" (/ˈkʊkə-bʌd/), while the second "o" is pronounced as "oo" (/ˈkʊkʊ-bʌd/). The silent "e" at the end of the word indicates that the vowel sound in the second syllable is a short "u" sound (/ˈkʌd/). Despite its unusual spelling, "Cuckoobud" is a real word meaning "a plant that blooms when the cuckoo calls."