Can you let us know what these have in common

Can you let us know what these have in common

1) Car & Tree
2) School & Eye
3) Computer & Brain
4) Desk & Human
5) Bed & Book
6) Plane & Birds
7) River & Money
8) Piano & Laptop
9) Tree & Hand
10) Bath tub & Socket
11) Arm & Clock
12) Printer & Octopus
13) House plant & Herbal drug
14) Fish & Musical theory
15) Apple & Earth
16) Light & Flower
17) Glasses & Displayed artwork
18) Headphones & Car tool
19) Football boots & Earings
20) Drum kit & Hunting trap

Have fun

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1) Car & Tree - TRUNK
2) School & Eye - PUPIL
3) Computer & Brain - MEMORY
4) Desk & Human - LEGS
5) Bed & Book - COVER
6) Plane & Birds - WINGS
7) River & Money - BANK
8) Piano & Laptop - KEYS
9) Tree & Hand - PALM
10) Bath tub & Socket - PLUG
11) Arm & Clock - HAND
12) Printer & Octopus - INK
13) House plant & Herbal drug - POT
14) Fish & Musical theory - SCALES
15) Apple & Earth - CORE
16) Light & Flower - BULB
17) Glasses & Displayed artwork - FRAME
18) Headphones & Car tool - JACK
19) Football boots & Earings - STUDS
20) Drum kit & Hunting trap - SNARE