Add 10 words to an existing vocabulary list.
existing vocabulary list: happy, sad, funny, angry, scared, excited, energetic, tired, confused, frustrated
New Vocabulary List: happy, sad, funny, angry, scared, excited, energetic, tired, confused, frustrated, anxious, elated, ecstatic, depressed, bored, joyous, melancholy, nervous, serene, exhausted.
Complete the following task based on the instruction and optional input provided.### Instruction:
Add 10 words to an existing vocabulary list.

### Input:
existing vocabulary list: happy, sad, funny, angry, scared, excited, energetic, tired, confused, frustrated

### Output:
New Vocabulary List: happy, sad, funny, angry, scared, excited, energetic, tired, confused, frustrated, anxious, elated, ecstatic, depressed, bored, joyous, melancholy, nervous, serene, exhausted.