Natural grammar refers to the use of language in a way that is intuitive and effortless. Synonyms for the term could include phrases like "organic language," "unforced syntax," or "inherent grammar." The idea behind natural grammar is that it is the result of being exposed to language in a natural setting rather than trying to learn it through rote memorization or forced drills. Some other possible synonyms for the term could include "instinctual expression," "unconscious language use," or "innate syntax." Regardless of the different ways the concept might be expressed, natural grammar is an important part of communication and our ability to convey meaning through language.