Cases of word usage

1) to relax and enjoy warmth and light (bask)

2) an apparatus for supplying warmth to a room or for heating water etc (heater)

3) to hatch (eggs) by sitting on them or by using artificial warmth (incubate)

4) to wrap or cover (a person, thing) for warmth or protection; to cover (a machine etc) to reduce the sound it makes (muffle)

5) the heavenly body from which the earth gets warmth and light; any fixed star with planets (sun)