Two studies explored the technical adequacy of various measures of advanced phonics skills. In Study 1, the advanced phonics measures consisted of pseudowords, real words, or a combination of both. Participants included 39 students in the third grade. Test-retest correlations for all measures were above 0.8 and interrater reliability was high. Correlations between the three advanced phonics measures and two subtests from the Wechsler Individual Achievement Test-Second Edition (WIAT-II) and Dynamic Indicators of Basic Early Literacy Skills (DIBELS), nonsense word fluency (NWF), and oral reading fluency (ORF) were moderate to moderately strong. The measures containing real words or a combination of pseudowords and real words performed best. The real word and combined pseudoword and real word advanced phonics measures were further studied along with a measure of multisyllabic word reading in Study 2 with 162 second and third graders. The advanced phonics measures were strongly correlated with Test of Word Reading Efficiency (TOWRE) scores. In both studies, regression analyses indicated the probe containing a mix of real and pseudowords was one of the few variables that made a significant prediction to criterion measures of phonics skills when all predictors were entered at once.