Group the following words into two categories according to their parts of speech: plant, flower, delicious, intelligent.
Nouns: plant, flower
Adjectives: delicious, intelligent.
Complete the following task based on the instruction and optional input provided.### Instruction:
Group the following words into two categories according to their parts of speech: plant, flower, delicious, intelligent.

### Output:
Nouns: plant, flower
Adjectives: delicious, intelligent.