Classify the given sentence as a metaphor or a simile.
The room was an oven.
The sentence, "The room was an oven," is a metaphor, which is a figure of speech that makes a direct comparison between two unlike things without using the words "like" or "as". In this case, the room is being directly compared to an oven, implying that the room was very hot.
Complete the following task based on the instruction and optional input provided.### Instruction:
Classify the given sentence as a metaphor or a simile.

### Input:
The room was an oven.

### Output:
The sentence, "The room was an oven," is a metaphor, which is a figure of speech that makes a direct comparison between two unlike things without using the words "like" or "as". In this case, the room is being directly compared to an oven, implying that the room was very hot.