The spelling of the word "Navier" is quite straightforward when using the International Phonetic Alphabet (IPA) phonetic transcription. The word is pronounced "na-vi-eh" with the stress on the second syllable. The "a" in the first syllable is pronounced as in "cat," while the "e" in the second syllable is pronounced as in "get." The "i" in the final syllable is pronounced as in "bit." Overall, the spelling of Navier reflects its French origin and can be easily pronounced using the IPA.