Based on the hints provided, the word you're looking for is likely "key." Here's how it fits with the hints:
First word hint: "This word is used in common for all meanings."
- "Key" is a word that can be used in various contexts, such as a key to a lock, a key in music, a key point in a discussion, or a key on a keyboard.
Second hint: "Shall we demonstrate great reasoning skills like a detective?"
- Detectives often use keys (as in crucial pieces of evidence or information) to solve cases.
Meaning hints:
- "The word in the OO part is the correct answer."
- "OO is included in the meaning of all words."
- "Key" fits this description because it is a fundamental concept in many different fields and contexts, making it a common thread in various meanings.
Therefore, the answer to the quiz is "key."