It appears in many English words, often with variations in spelling, such as:
* Agnostic: One who believes that the existence of God is unknown or unknowable.
* Cognition: The mental process of knowing, including awareness, perception, reasoning, and judgment.
* Diagnosis: The identification of the nature of a disease or problem by examination of the symptoms.
* Gnosis: A state of knowing or understanding, especially esoteric or mystical knowledge.
* Ignorance: Lack of knowledge or information.
* Prognosis: A forecast of the likely course of a disease or ailment.
* Recognize: To identify someone or something from previous knowledge or experience.
* Synonym: A word that has the same or nearly the same meaning as another word.
These are just a few examples, and the root "kno" or "gno" appears in many other words related to knowledge, understanding, and perception.