The spelling of the word "Forest Arius" can be explained using IPA phonetic transcription. The first part of the word, "Forest," is spelled /ˈfɒrɪst/. The "o" sound is pronounced as the schwa /ə/, while the "r" sound is tapped /ɾ/ in British English. The second part of the word, "Arius," is spelled /ˈærɪəs/. The "a" sound is pronounced as the near-open front unrounded vowel /æ/, while the "i" sound is pronounced as the near-close near-front unrounded vowel /ɪ/.