coilovers = spring and shock combo where the strut perch (where the spring sits and rests on the strut/shock) is adjustable in height
lowering springs = springs that are made at a higher or equal spring rate, but have the car sit lower.
These are springs
These are coilovers, you can see the perch looks like 2 metal nuts, and just behind the black spring u can see the silver threads that the nuts can be screwed up or down to set the ride height