A word at the beginning of a hot word

The words at the beginning of the hot word:

Enthusiasm,

Warm,

Hot water,

Love,

Hot weather,

Lively,

Tropical,

Hot,

Heat,

Heat wave,

Enthusiasm,

Enthusiasm,

Warm,

Heat,

Hot filial piety,

Hot blood,

Heat engine,

Eager,

Hot dogs,

Hot,