Feather is to bird as fur is to ...
mammal
Sun is to solar system as nucleus is to ...
atom
Umbrella is to rain as sunscreen is to ...
sun
Pen is to writing as paintbrush is to ...
painting
Heart is to love as brain is to ...
think
Key is to lock as password is to ...
computer
Gasoline is to car as food is to ...
human
Engine is to car as heart is to ...
human
Honey is to bee as milk is to ...
cow
Water is to river as sand is to ...
desert (or beach)
Sail is to sailboat as wing is to ...
airplane
Glasses are to eyes as headphones are to ...
ears
Tree is to forest as star is to ...
galaxy (or space)
Wheel is to bicycle as oar is to ...
rowboat
Tires are to car as shoes are to ...
feet
Chef is to kitchen as conductor is to ...
orchestra
Glove is to hand as sock is to ...
foot
Battery is to remote control as charger is to ...
smartphone
Keyboard is to computer as steering wheel is to ...
car
Petal is to flower as leaf is to ...
tree
Moon is to night as sun is to ...
day
Pencil is to eraser as knife is to ...
cutting board
Fuel is to fire as oxygen is to ...
life
Roots are to plants as foundation is to ...
building