There are no single words that are antonyms for instead. Some phrases that are the opposite of instead are 'as well' and 'in addition.'
Unorganized
Petroglyphs antonym is,A writing of something instead of a drawing or carving
Disproportional.If instead you're looking for the antonym of directly proportional, that would be inversely proportional.
An antonym for compress is expand. This means to make something larger or more spread out instead of making it smaller or more compact.
perhaps "hide" ... instead of showing or portraying something, you hide it.
Sonar is a method of sound based ranging. Therefore as an object it is not subject to an antonym. There is the principal of radar which can also range, but it uses radio waves instead.
An antonym for wood would be a product other than wood such as tile. Instead of wood cupboards, some may choose metal.
Fumaroles are steam vents. There is no true opposite.
Futurology is defined as the "study of the future."
gentle, easy, pleasing, smooth, soft, mild, peaceful
I am not sure but technology might be one.
Well, darling, an antonym for niter would be purify. Niter is a mineral used in making gunpowder, so if you want to do the opposite and clean things up, you'd be looking at purifying instead. Hope that clears things up for you, honey.