universe

Examples-

~spelling    cosmo  =  cosm + vowel

cosmic - having to do with the universe
cosmologist - an expert in the study of the universe

one who is obsessed

Examples-

pyromaniac - one who is obsessed with fire
theomaniac - one who  is obsessed with a god

not

Examples-

unaware - not aware                   

unclean - not clean

evil spirits

Examples-

~spelling    demono = demon + vowel

demonologist – an expert in the study of evil spirits
demonic - having to do with evil spirits

Caution:  Not "demonstrate"   (de + monstr)

heat

Examples- 

geothermal - having to do with the earth's heat
thermodynamics - the study of the power of heat                        Note:  --thermy    =    production of heat

condition of being

Examples-

difference - condition of being different
reliance - condition of relying