The spelling of "cavender" is quite straightforward when one considers its IPA phonetic transcription. It begins with the "k" sound, represented by the symbol /k/ followed by the "ae" sound, denoted by the symbol /æ/. The "v" sound is spelled as /v/ while the "en" sound is written as /ɛn/. Finally, the word ends in the syllable "-der," which is represented by the symbols /dɚ/. Therefore, the correct spelling of "cavender" in IPA phonetic transcription is /kævɛndɚ/.