Categorize these words into adjectives and nouns.
Fast, car, slow, desk
Adjectives: Fast, slow
Nouns: Car, desk
Complete the following task based on the instruction and optional input provided.### Instruction:
Categorize these words into adjectives and nouns.

### Input:
Fast, car, slow, desk

### Output:
Adjectives: Fast, slow
Nouns: Car, desk