Which word can be added to known to you? From a compound additive best not most well

The word "not" can be added to "known" to form "unknown."

The word that can be added to "known" to create a compound word is "well-known."

To find the word that can be added to "known" to form a compound word, we need to consider the words "best" and "most well." Compound words are formed by combining two or more separate words to create a new word with a new meaning. In this case, we need to find a word that can be added to "known" to create a compound word.

Let's analyze the given options:
- "Best" is an adjective that means of the most excellent or desirable type or quality.
- "Most" is an adverb used to indicate the superlative degree of something.
- "Well" is an adverb that means in a good or satisfactory manner.

Comparing these options to "known," the word that fits best is "well." Adding "well" to "known" creates the compound word "well-known," which means widely recognized or famous.

Therefore, the word that can be added to "known" from the given options is "well," resulting in the compound word "well-known."