The word "pentup" is not a correct spelling in English. However, it can be understood as a possible misinterpretation of the word "pent-up", which means to have something held back or suppressed. The correct spelling is with a hyphen, and the pronunciation is /ˈpɛntʌp/, with the stress on the first syllable. This phonetic transcription indicates that the "e" in "pent" is pronounced as "eh" while the "u" in "up" is pronounced as "uh". Remember to always double-check your spelling to avoid confusion or misunderstanding.