The spelling of the word "Radilla" can be explained through its phonetic transcription in IPA. The first syllable "Ra" is pronounced as /rɑː/, where the "a" sound is stressed and elongated. The second syllable "dil" is pronounced as /dɪl/, where the "i" sound is short and pronounced as "ih". The final syllable "la" is pronounced as /lə/, where the "a" sound is pronounced as "uh". Therefore, the spelling of "Radilla" can be explained through its distinct phonetic sounds /rɑːdɪlə/.