The word "impast" is often misspelled as "impass". This mistake can be explained through phonetic transcription. "Impast" is pronounced /ɪmˈpæst/, with the stress on the second syllable. The "a" in the second syllable is pronounced like the "a" in "cat". On the other hand, "impass" is pronounced /ɪmˈpæs/, with the stress on the first syllable. The "a" in the first syllable is pronounced like the "a" in "father". These subtle differences in pronunciation can lead to common spelling errors.