The spelling of the word "WACES" can be explained using IPA phonetic transcription. The first sound is represented by the letter "W" which is pronounced as /w/. The following sound is represented by the letter "A" which can have different pronunciations depending on the accent, but in General American English, it is pronounced as /eɪ/. The next sound is represented by the letter "C" which is pronounced as /s/. Finally, the letter "ES" is pronounced as /ɛz/. Therefore, the proper pronunciation of "WACES" is /weɪsɛz/.