The spelling of the word "chalker" is straightforward when broken down phonetically using IPA transcription. The first sound is the voiceless velar stop "k", followed by the diphthong "au" which can sound like the "ow" in "cow." The next sound is the voiceless alveolar fricative "s" and finally, the word ends with the voiceless alveolar stop "t." Altogether, the word is pronounced as "kaw-ks-t" and refers to someone who chalks or uses chalk.