Twenty-three word meanings had cognate class sizes of four or more. Words used more than once per 1,000 spoken words (χ2=24.29, P<0.001), pronouns (χ2=26.1, P<0.0001), and adverbs (χ2=14.5, P=0.003) were over-representing among those 23 words. Frequently used words, controlled for part of speech, were 7.5 times more likely (P<0.001) than infrequently used words to be judged as cognate. These findings matched their "a priori" predictions about word classes more likes to retain sound and meaning over long periods of time. The authors write "Our ability to predict these words independently of their sound