There are infinite energies of the Absolute (ananta), but they can all be divided into spiritual and material. Spiritual have at least some freedom, material are totally predictable, with zero freedom. Hari-nāma-cintāmani uses the terms "cit" and "acit" respectively to refer to them.
"cit" means "consciousness" and "chaitanya" means "one endowed with consciousness".
"ātmā" means "self" and also has the connotation of atomicity, as the basic unit of something. The usual meaning of "ātmā" is "soul" or the smallest indivisible fragment of spiritual energy, but in various contexts "ātmā" can refer to the body, the mind, the soul or the supreme soul (which are 4 different concepts).
For most practical purposes both terms are synonymous (and also synonymous with "jīva"), but they are stressing a different aspect of the soul.