hot (to the touch)

passionate (feelings, etc.); ardent; hot (e.g. gaze)

hot (e.g. temper)

zealous; enthusiastic; fired up

intense; severe; extreme

hot (topic); of interest

heat

fever; temperature

Suffix

zeal; passion; enthusiasm; mania; craze; rage

zealous; enthusiastic; ardent; fervent; keen; eager

passion; enthusiasm; zeal

heat; hot air

enthusiasm; excitement; fervour; fervor; heated atmosphere

fever

burn; scald

getting one's fingers burned (e.g. poor investment, mixing with the wrong people)

to feel hot; to flush; to burn

becoming red-hot; red heat; scorching heat; burning heat

burning (love); passionate (e.g. debate); ardent

zeal; enthusiasm; ardor; ardour

high fever

intense heat