Dictionary definitions such as this one often seem to use the terms sentience, awareness, and consciousness as if they are synonymous with each other. Is this really the case? If not, how do they differ? Some books suggest that sentience and awareness are simply facets of the larger concept of consciousness.
These are all terms that one frequently reads in texts on Cognitive Science. I will try to find some exemplary definitions:
If I'm not mistaken it's halfway safe to say that awareness and sentience are levels or subclasses of the consciousness. Awareness is mainly the physical act of perceiving, while sentience is a subjective way of actually being affected. Consciousness then is used in many different meanings, but often as a umbrella term for several faculties. Hope I could help, check the links for more information.