General:
* Concrete: This implies something solid, physical, and easily perceived.
* Empirical: This refers to something based on observation and experience, often using data and measurements.
* Objective: This suggests something based on facts and not personal opinions or feelings.
More Specific:
* Quantifiable: This means something that can be measured and expressed numerically.
* Material: This emphasizes the physical and substantial nature of something.
* Actual: This highlights the reality and existence of something.
* Physical: This clearly refers to something with a physical form.
Examples:
* Concrete: "We need concrete evidence to support our claims."
* Empirical: "Empirical studies have shown that this treatment is effective."
* Objective: "The objective measurements showed a significant difference."
* Quantifiable: "The company's profits are quantifiable and have increased steadily."
* Material: "The material world is full of wonders."
* Actual: "The actual cost of the project was higher than expected."
* Physical: "The physical evidence was presented in court."
The best word to use will depend on the specific situation and the emphasis you want to make.