Phonology is a branch of linguistics that studies how languages or dialects systematically organize their sounds (or constituent parts of signs, in sign languages). The term also refers to the sound or sign system of any particular language variety. At one time, the study of phonology only related to the study of the systems of phonemes in spoken languages.

Vocabulary development is a process by which people acquire words. Babbling shifts towards meaningful speech as infants grow and produce their first words around the age of one year. ... Children's phonological development normally proceeds as follows: 6–8 weeks: Cooing appears 16 weeks: Laughter and vocal play appear 6–9 months ...

Word lists. A number of sight word lists have been compiled and published; among the most popular are the Dolch sight words (first published in 1936) and the 1000 Instant Word list prepared in 1979 by Edward Fry, professor of Education and Director of the Reading Center at Rutgers University and Loyola University in Los Angeles. Many commercial products are also …