No
The opposite (antonym) would be basement or cellar,or pretty much anything below ground since an attic is at the top part of a house.
An attic is a space found directly below the pitched roof of a house or other building (also called garret, loft or sky parlor). Attic is generally the North American English term for it.
An attic is the space found just below the roof of a building, typically used for storage or as an extra living space. Attics are often accessed through a ceiling hatch or a set of stairs.
The air handler in a house with an attic should be located in the attic space to efficiently distribute heated or cooled air throughout the house.
Attic joists in a house's construction provide structural support for the attic floor and help distribute the weight of the roof and any stored items in the attic evenly across the walls and foundation of the house.
Attic insulation helps keep a house cool during summer by preventing heat from entering the living spaces below. It acts as a barrier, reducing the transfer of heat from the hot attic to the cooler areas of the house, making it easier to maintain a comfortable temperature indoors without overworking the air conditioning system.
Basement/cellar.
On a house in the attic
There are some strange noises coming from the attic.
The Weasleys had a "house ghost" that lived in their attic.
Attic.
An attic.