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You can get a special weed n feed for lawns from the garden centre. It kills broad leaved weeds but not grass. You should not put the mowings on the compost heap after you have used this.
Anything that is not grass is broadleafed, whatever its shape. That is how they differentiate them. Some weedkillers can be used on broadleafed weeds, but will not kill the grass. Some weedkillers will kill everything.
It will say on the label.
The 'spiky' holly-like leaves you mention sound like dandelions
which are a beggar to get out as they have extremely persistent and deep roots. Never used a lawn weedkiller (though I think I might have to soon!)
Maybe the rounded ones are plantains?