The spelling of the word "Collish" can be explained using the International Phonetic Alphabet (IPA) transcription. The first sound in "Collish" is a voiced velar stop /ɡ/. Next, there is an open mid front unrounded vowel /ɛ/ followed by a lateral approximant /l/. The final sound is an unvoiced postalveolar fricative /ʃ/. Therefore, the correct spelling of this word is "Collish" and its pronunciation is /ˈkɒlɪʃ/. It is important to use proper phonetic transcription to ensure accurate pronunciation and communication.