The spelling of the word "Lapier" can be explained using IPA phonetic transcription. The first syllable "La" is pronounced as "lɑ", with the "ɑ" sound being similar to the "a" in "car". The second syllable "pi" is pronounced as "pi", with the "i" sound being similar to the "ee" in "sheep". The final syllable "er" is pronounced as "ɚ", with the "ɚ" sound being similar to the "er" in "butter". Therefore, the correct spelling of the word is "Lapier".