Here is a guide for all 198 elements. Credit is not mine, original list is here:
https://ayumilove.net/doodle-devil-guide/1. ANIMALS
Air + Vampire = Bat
Start with = Beast
Magic + Stone = Egg
Beast + Water = Fish
Air + Rat = Pigeon
Fish + Weapon = Piranha
Beast + Diseases = Rat
Egg + Worm = Snake
Beast + Wrath = Wolf
Earth + Life = Worm
2. DEMONS
Demon + Knowledge = Astaroth
Demon + War = Baal
Beast + Demon = Chimera
Demon + Water = Cthulhu
Demon + Wrath = Kronos
Demon + Money = Mammon
Demon + Stone = Medusa
Demon + Sacrifice = Shub-Niggurath
Demon + Woman = Succubus
3. DESTRUCTION
Biological Weapon + War = Armageddon
Missile + Spore = Biological Weapon
Missile + Poison Gas = Chemical Weapon
Demon + Sect = Communism
Politician + Politician = Democracy
Demon + Politician = Dictatorship
Army + Politician = Dictatorship
Earth + Earth = Earthquake
Chaos + Diseases = Epidemic
Bomb + Mushroom = Nuclear Bomb
Earthquake + Water = Tsunami
4. ELEMENT
Start with = Air
Beast + Fire = Ash
Start with = Earth
Air + Fire = Energy
Start with = Fire
Earth + Fire = Lava
Fire + Stone = Metal
Fire + Water = Steam
Lava + Water = Steam
Lava + Water = Stone
Start with = Water
5. EVIL
Corruption + Dictatorship = Chaos
+ = Darkness
Human + Life = Death
Tobacco + Woman = Diseases
Fire + Soul = Inferno
Demon + Energy = Magic
Heresys + Religion = Sect
Human + Apple = Sin
Death + Water = Styx
Fire + Human = Suffering
Human + Torture = Suffering
6. GOOD
Life + Light = Angel
Human + Human = Friendship
Human + Prayer = Heavens
Human + Human = Life
Start with = Light
Start with = Order
Angel + Human = Prayer
Human + Prayer = Religion
Corpse + Soul = Resurrection
Demon + Human = Soul
7. HUMANS
Human + Torture = Blood
Fire + Human = Corpse
Demon + Human = Corpse
Human + Life = Corpse
Death + Human = Corpse
Human + Tree = Food
Start with = Human
Copyright + Human = Lawyer
Human + Torture = Leather
Man + Woman = Life
Human + Pride = Politician
Man + Woman = Sex
8. MEDIEVAL
House + Vampire = Castle
Egg + Magic = Dragon
Angel + Earth = Elf
Beast + Snake = Hydra
Pigeon + Unicorn = Pegasus
Pigeon + Fire = Phoenix
Knowledge + Magic = Spell
House + Wizard = Tower
Beast + Magic = Unicorn
Energy + Human = Wizard
9. MONSTERS
Beast + Death = Cerberus
Beast + Darkness = Demon
Corpse + Electricity = Frankenstein
Death + Human = Ghost
Corpse + Zombie = Ghoul
Darkness + Human = Mutant
Blood + Human = Vampire
Beast + Human = Werewolf
Corpse + Life = Zombie
10. NATURE
Start with = Apple
Life + Spore = Bacteria
Energy + Seeds = Coffee
Earth + Seeds = Grass
Earth + Seeds = Mushroom
Grass + Weapon = Razorvine
Apple + Earth = Seeds
Mushroom + Seeds = Spore
Fire + Grass = Tobacco
Earth + Seeds = Tree
11. SCIENCE
Life + Void = Alien
Grass + Work = Cellulose
Fire + Radiowave = Laser
Energy + Fire = Plasma
Radiowave + Radiowave = Radiation
Airplane + Void = Rocket
Rocket + Void = Satellite
Alien + Rocket = UFO
Diseases + Human = Virus
Heavens + Inferno = Void
12. SCIENCE FICTION WEAPONS
Inferno + Weapon = BFG 9000
Alien + Weapon = Death ray gun
City + Space Ship = Death Star
Void + Weapon = Disintegrator
Armor + Energy = Force Field
Force Field + Laser = Light Saber
Plasma + Weapon = Plasmagun
Soldier + Void = Space marine
Battle Cruiser + Rocket = Space Ship
Bomb + Void = Vacuum Bomb
13. SECURITY
Order + War = Army
House + House = City
Money + Politician = Corruption
Internet + Life = Cyberspace
Army + Politician = Empire
Computer + Knolwedge = Hacker
Knowledge + Knowledge = Scientist
Firearm + Warrior = Soldier
Knowledge + War = Surveillance
Chaos + War = Terrorism
14. SINS
Greed + Sin = Envy
Food + Sin = Gluttony
Money + Sin = Greed
Religion + Sin = Heresy
Sex + Sin = Lust
Corpse + Sin = Murder
Sin + Sin = Pride
Sin + Work = Sloth
Money + Sin = Theft
Cthulu + Fire = Wrath
15. SOCIETY
Heresy + Human = Atheism
Human + Knowledge = Book
Sex + Sex = Censored
Demon + Order = Copyright
Greed + Human = Gambling
Human + Apple = Knowledge
Demon + Soul = Money
Heresy + Human = Psychology
Greed + Politician = War
Human + Money = Work
16. TECHNOLOGY
Human + Sloth = Car
Computer + Radiowave = Cellphone
Book + TV = Computer
AI + Robot = Cyborg
Energy + Metal = Electricity
Computer + Computer = Internet
Air + Electricity = Radiowave
Knowledge + Sloth = Robot
Demon + Mechanism = TV
17. TOOLS
Sulfur + Water = Acid
Metal + TNT = Bomb
Human + Stone = House
Metal + Work = Mechanism
Earth + Knowledge = Oil
Coffee + Tobacco = Poison
Air + Poison = Poison Gas
Air + Inferno = Sulfur
Acid + Oil = TNT
Human + Metal = Weapon
18. WAR MACHINES
Air + Car = Airplane
Computer + Life = Airplane
Cannon + Water = Battle Cruiser
Airplane + Bomb = Bomber
Bomb + Weapon = Cannon
Air + Mechanism = Helicopter
Bomb + Earth = Land mine
Fire + Oil = Napalm
Air + Surveillance = Radar
Battle Cruiser + Fish = Submarine
Armor + Car = Tank
19. WEAPONS
Firearm + Magic = AK-47
Metal + Warrior = Armor
Missile + Weapon = Bazooka
Firearm + Pride = Desert Eagle
Gunpowder + Weapon = Firearm
Fire + Weapon = Flamethrower
Acid + Cellulose = Gunpowder
Bomb + Soldier = Hand grenade
Bomb + Rocket = Missile
Human + Wrath = Warrior
20. WITCHCRAFT
Demon + Pigeon = Crow
Wizard + Zombie = Necromancer
Magic + Water = Potion
Murder + Religion = Sacrifice
Leather + Magic = Scroll
Corpse + Worm = Skeleton
Book + Magic = Spell Book
Suffering + Suffering = Torture
Magic + Weapon = Wand
Magic + Woman = Witch