Examined effect of word class (nouns vs. verbs) on second language pronunciation accuracy of Korean-English adult bilinguals whose age of arrival in the United States ranged from 6 to 23 years. Transcriptions of their productions of English indicated they were more accurate in pronouncing verbs than nouns and were more accurate in detecting incorrect formulations of verbs than nouns. Effects were significant in later learners. (Author/VWL)