This dress is nicer, but it's more expensive.
Comparatives
Nicer is the comparative form of nice. More expensive is the comparative form of expensive.
Comparative form = ...er or more ...:
This room is warmer than my bedroom.
Pizza is more delicious than hamburgers.
He runs faster than me.
The rain is heavier now than in the morning.
We can use than with comparative adjectives and adverbs:
You are older than me.
My bedroom is bigger than the living room.
...er
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