The spelling of "wast substantive" might seem strange at first glance, but it makes sense when you break it down phonetically. "Wast" is pronounced /wɑːst/, with a long "a" sound in the first syllable and a consonant blend for the second. "Substantive" is pronounced /səbˈstæn.tɪv/, with the stress on the second syllable and a combination of vowel sounds and consonants that may be challenging to spell correctly. However, with practice and attention to phonetics, you can confidently use this term in your writing and communication.