An example of an abstract noun is bliss, tuna, rice, or mogul,

Answer : bliss

Based on the choices above, "bliss" is the only example of an abstract noun. Abstract nouns are names of persons, places, things or events that are not concrete. These nouns cannot be seen, heard, tasted, touched and even smelled by any of the human senses. Abstract nouns are ideas, qualities, concepts and events perhaps as long as they are perceivable by any of the human senses.