"Pinnacle" is a word used to describe the highest point or peak of a mountain, building or achievement. Its spelling is a little tricky, as it can be easily mistaken with the word "pinnacl" or "pinnacal". The correct spelling of "pinnacle" is /ˈpɪnəkl/ - this IPA phonetic transcription shows that there are two syllables, with the stress on the first syllable "PIN". Remembering the correct spelling and phonetics of "pinnacle" can help avoid confusion and improve communication in written and verbal communication.