The word "Lengest" is a misspelled version of the word "Longest." The correct spelling features a diphthong, "oʊ," which is pronounced like "oh." This sound can be broken down into two parts: "ɔ" and "ʊ." The "ɔ" sound is like "awe," while "ʊ" is like "uh." Together, they create the "oh" sound. In contrast, "e" and "ɛ" do not create the desired sound in English. As such, it is crucial to spell the word correctly as "Longest."