The word "yrsa" is pronounced as /iɹsə/. The spelling of this word can be explained using IPA phonetic transcription. The first letter "y" indicates a high front rounded vowel /i/, followed by the letter "r" which represents an alveolar approximant /ɹ/. The letter "s" denotes a voiceless alveolar sibilant /s/ and the letter "a" represents a schwa sound /ə/. Therefore, the spelling of "yrsa" accurately reflects its pronunciation in English.