The spelling of the word "robbs" is incorrect as it violates the rule "i before e except after c," which should have made the word "robs" instead. The correct IPA phonetic transcription of the word "robs" is /ɹɑbz/ with the stressed vowel pronounced as "ah" and the final consonant pronounced as a voiced "z" sound. It is important to pay attention to spelling rules and phonetic transcriptions to accurately communicate and understand language.