It is not correct to spell the word "Agood". In English, we typically use a space between "a" and "good" to form the phrase "a good". The correct phonetic transcription of "a good" is /ə ɡʊd/. The symbol /ə/ represents the schwa sound, which is the unstressed sound we make when saying "uh" or "er". The symbol /ɡ/ represents the voiced velar stop sound, which is the sound we make when pronouncing the letter "g".