The spelling of the word "Shadduck" comes from the phonetic transcription of its pronunciation. The correct spelling is "shad·duck," with the emphasis on the first syllable. The "sh" sound is represented by the IPA symbol /ʃ/ and the "a" sound is represented by /æ/. The "d" is followed by the "u" sound, represented by /ʌ/, and the final "ck" is represented by /k/. This unique combination of sounds creates the word "Shadduck," which refers to a type of diving duck found in North America.