The difference between healthy and healthy is: different pronunciation, different meaning, and different usage.

1. Different pronunciations

1. healthy

Pronunciation: British [?helθi]? American [?helθi]?

2 .healthier

Pronunciation: British [?h?lθ?]? American [?h?lθi?r]?

2. Different meanings

1. healthy

Definition: adj. healthy, reflecting health.

2.healthier

Definition: adj. healthy, robust, beneficial to health.

3. Different usages

1. healthy

Usage: It cannot be used to express temporary health, but refers to a long-term state or process. The extension can be interpreted as "(things) prosper and develop well".

Example: She?has?a?refreshingly?healthy?attitude?to?work.

Translation: She has a wise attitude towards work, which is refreshing.

2.healthier

Usage: ?Healthier is to change the y after healthy to i and then add er, so it is a comparative form, so it means healthier.

Example: After?taking?time?off?to?recuperate,?he?looks?much?healthier.?

Translation: He has rested for a while and looks much better.