enthusiast (n) – a person having a strong liking for something
enthusiasm (n) – a feeling of excitement, a lively interest
enthusiastic (adj) – having or showing great excitement/interest
enthusiastically (adv) – in an enthusiastic manner, in an interest-filled manner
1. I am a Japan enthusiast!
2. His enthusiasm for the English language is increasing.
3. She is enthusiastic about reading novels.
4. The Professor gave an enthusiastic response on the student’s presentation.
5. They discussed the program enthusiastically.