warmer

adj

1. (comparative, form-of)comparative form of warm: more warm

noun

1. Something that warms (something else) by providing some small amount of heat, such as a hot water bottle or a soup.

   “[…] tortillas are kept warm and moist in an electric warmer […]”

2. A piece of clothing for warmth via insulation of body heat.
3. An introductory activity, for example in a lesson, to stimulate interest in a topic.