1, health
The basic meaning of health can refer to both physical health (good or bad) and mental health, which is an uncountable noun. Health can sometimes be used as a greeting, as an explanation of "I hope someone is healthy", as an uncountable noun or countable noun.
2. Health
As an adjective, health basically means "healthy and robust", which means that people are in good physical and mental condition and rarely get sick. Extension can be interpreted as "(things) flourish and develop well." Health can not be used to express temporary health, but refers to a long-term state or process.
Second, the distinction between parts of speech.
1, health
English [helθ] beauty [h? lθ]
(noun) hygiene; Medical care; health condition
2. Health
English [? Helθi] beauty [? h？ lθi]
(adjective) healthy; Sound; Rich; sanative
Third, the difference between examples.
1, caffeine? Is it? Not good? For what? Yours Healthy. ?
Caffeine is harmful to human health.
Although my uncle is old, he looks strong and healthy.
Although my uncle is old, he still looks strong.