@Love_my_doggie: In my experience, hunger refers to the state of being hungry, while hungry refers to feeling or displaying the need for food. Here again, as I explained in my initial response to this question, we are comparing a noun and an adjective. And just as in that case, the noun describes a state of being that adjective.
@Hypocrisy_Central: Sneki doesn’t seem to be guessing at what happiness is, Sneki seems to have a firm grasp on the definition of the word. While your explanation of how someone could be happy without having happiness shows a distinct lack of understanding of the definition of these terms. Happiness and unhappiness are both nouns describing a state of emotion. These emotions are prone to change, as stimuli changes. It is possible to be unhappy all the time, and such a person would never feel happiness. However, if there is a change from feeling unhappy to feeling happy, even for a moment, then for that moment the individual would be experiencing happiness.
@zenvelo: I’m afraid that your explanation is also fundamentally flawed. If you were not experiencing happiness, you would not feel happy. Happiness is the state of feeling happy. Happy is feeling or showing pleasure or contentment. To say you were happy, but not in a state of happiness… Would be an oxymoron. As though saying, “The ice was not frozen,” where frozen is an adjective meaning, “congealed with cold or turned into ice,” and ice is a noun referring to, “frozen water, a brittle, transparent crystalline solid.” Ice is (by definition) frozen and being frozen refers to a state of being turned into ice.
@ARE_you_kidding_me: Again, while happy can refer to a sense of contentment, happiness simply refers to the state of being happy. So if one is happy (feeling content), one is experiencing happiness.
@babaji: See above.