The word "COMPRE" is not a standard word in English, and therefore does not have an established spelling or pronunciation. However, if we assume that the intended word is "compré", which is the past tense form of the French verb "acheter" meaning "to buy," then its spelling can be explained using IPA phonetic transcription as [kɔ̃pʁe]. The nasal vowel sound in the first syllable is represented by the "õ" symbol, and the final "é" sound is represented by the "e" with an acute accent.