Many words in English have multiple spellings. In some cases, however, a deviation is an error, and nothing else. Children learning English in school are exposed to formal grammar lessons at an early age, and they learn the language’s complexities as they progress through the educational system. Yet, many writers are unsure of the correct spelling of the word grammar. This uncertainty leads to embarrassing mistakes. To be fair, however, Grammer is also a word used in English that does have appropriate usage cases. None of them have anything to do with grammar, though.
Consider the sentences below:
Grammar as noun:
In English, the word grammar is used as a noun which means the whole system and structure of a language or of languages in general, usually taken as consisting of syntax and morphology (including inflections) and sometimes also phonology and semantics.
Grammer as noun:
Billy Grammer, for instance, was an American country music singer and accomplished guitar player. Grammer is also the name of a small community in Rock Creek, Indiana, USA that was likely named for a railroad official.
It had already been established that dogs respond to human voices better than their wolf brethren, are able to match hundreds of objects to words and learn elements of grammar, and can be directed by human speech. –The Washington Post
Grammar or grammer:
Is it grammar or grammer? If you misuse Grammer, you leave yourself open to criticism and weaken your writing. It’s important to get this distinction right the first time. Grammar is a set of rules about the structure of language. Grammer is a proper noun that refers to a particular American community, or the name of a person. You should only use Grammer in the above contexts. Remember that Grammer shares the letter E with Cheers, a show that made actor Kelsey Grammer famous.