Words that a reader recognizes without having to sound them out. Some sight words are "irregular," or have letter-sound relationships that are uncommon. Some examples of sight words are you, are, have and said.
words that do not follow any standard pronunciation pattern and so must be memorized. Words that cannot be ‘sounded out' such as, said, some, they. Sight words can also be words that are so common that they should be recognized without any conscious mental effort (words like ‘the' ‘and' ‘of' etc).
also referred to as "high frequency words" these are words that students should be able to identify by simply looking at them. They are often words that occur commonly in written text (and, the, they, with, etc.)