I'm a linguistics grad student at McGill University.
In Greek, the suffix -ma added to a verb stem signifies the result or effect of the action expressed in the verb. Thus, phantasma signifies the object of fantasizing, politeuma means the act of politicizing (the political entity), rhema signifies the effect of speaking (the word), horama means the object of seeing (the view, as in ‘panorama’), and migma means the effect of mixing (the mixture).
The term noema then means the thing being thought or the thing we are aware of.