A common noun is a generic name for a person, place or thing in a class or group. Common nouns can be concrete, abstract or collective.
An abstract noun is an intangible concept includes liberty, anger, freedom, love, generosity, charity, and democracy. Notice that these nouns express ideas, concepts, or qualities that cannot be seen or experienced. We cannot see, hear, touch, taste, or smell these concepts.
Noun forms from the words from "How The Dog Found Himself a Master!":
Collective nouns are names for an assemblage of a number of people, animals or things. Words like bunch, pride, flock and swarm are collective nouns.