Tier 1
Words Tier 1 words are the most basic, commonly occurring words in English. Many of the Tier 1 words are easily recognized by native speakers of English but not necessarily by second language learners. Adult second language learners typically know the concepts of these words, as well as the labels for them in their native language. They may not, however, know the English labels. To illustrate, consider the word, dog, which is translated as perro in Spanish.