The spelling of the word "teicher" can be explained using the International Phonetic Alphabet (IPA). The word is pronounced as /ˈtaɪkər/, with the stress on the first syllable. The "ei" in the word is pronounced as a diphthong, consisting of the vowels /aɪ/, while the "ch" is pronounced as the fricative /k/. The final syllable is pronounced as /ər/. The spelling of the word "teicher" accurately reflects its pronunciation using the IPA.