The spelling of the word "vetest" can be explained using the International Phonetic Alphabet (IPA). The first sound is represented by the letter "v" which is a voiced labiodental fricative /v/. The second sound is represented by the letter "e" which is pronounced as a short mid front unrounded vowel /ɛ/. The third sound is again represented by the letter "t" and is a voiceless alveolar stop /t/. Finally, the word ends with the suffix "-est" which signifies the superlative degree. So, "vetest" is pronounced as /vɛtɛst/.