The spelling of the word "step pest" in IPA phonetic transcription would be /stɛp pɛst/. The first syllable "step" is pronounced as "stɛp", with the "e" sounding like the "e" in "bet". The second syllable "pest" is pronounced as "pɛst", with the "e" sounding like the "e" in "pet". "Step pest" is a compound word that refers to a type of pest that is known for being attracted to and often found on stairs or steps.