heatsink = fan?

It is formally calld the heatsink/fan. Normally you can call it the heatsink which is a fan directly on the cpu like you'll have in your pc.
 
The heatsink is referred to the metal device (with a bunch of fins) that helps to draw out high temp created by the processor by means of a separate device (usually a fan) which is normally mounted on the heatsink.
 
ya, fan = plastic (normally small) heatsink = metal, fan mounted on, heatsink normally mid size ...
 
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