The word "archbanc" is not commonly used but it can be spelled using IPA phonetic transcription as /ɑrtʃbæŋk/. The first part of the word "arch" is pronounced as /ɑrtʃ/ to represent the "ch" sound. The second part "banc" is pronounced as /bæŋk/ to reflect the "ng" sound. The letter "c" in "banc" is silent. While this word may not be familiar, understanding IPA can help with proper pronunciation and spelling of other words.