General Terms:
* Vernacular: This is a good broad term for the language spoken by a particular group of people, including its slang and regionalisms.
* Informal English: This term emphasizes the less formal aspects of the language, contrasting with formal written English.
* Everyday English: This emphasizes the language used in daily conversations.
More Specific Terms:
* Colloquialisms: This term specifically refers to informal words and phrases that are commonly used in a particular region or group.
* Slang: This focuses on words and phrases that are informal and often used by a specific group, often for a short period of time.
* Idioms: This term refers to phrases that have a figurative meaning, often different from the literal meaning of the words.
* Jargon: This term focuses on specialized language used by a particular profession or group, such as medical jargon or legal jargon.
The best word depends on the specific context. If you want to emphasize the informality of the language, "informal English" or "vernacular" might be appropriate. If you want to focus on specific types of language, you could use terms like "slang," "colloquialisms," or "idioms."
You could also use a phrase like "a wide range of English usage," which would be more inclusive and avoid limiting yourself to a single word.