Language is a complex process and a form of communication integrated with thoughts. The communication of thoughts is through the method of language. The definition of cognitive psychology is the study of mental processes, such as perceiving, thinking, believing, problem solving, remembering, speaking, decision making, learning, and reasoning implies that language influences cognitive processes. Therefore, what an individual or human animal learns and interprets through language and the ability of language is a cognitive process that separates human animals from nonhuman animals. Language is communicative, arbitrary, structured, generative, and dynamic.
Lexicon is a mental dictionary. A lexicon contains several representations of known words and those representations include spelling, part of speech for each word, and pronunciation. A lexicon aids individuals in a matching process of spoken words and those word’s meanings. Therefore, individuals recognize words through this matching process because spoken words are comparable with a lexicon (a mental dictionary). A lexicon is a key aspect important for an individual’s use of language. Language’s key features are the properties that make it communicative, arbitrary, structured, generative, and dynamic. As for communicative, language simply allows individuals to communicate with each other. As for arbitrary, Willingham (2007), “the relationship between the elements in the language and their meaning is arbitrary” (p. 411). A key