“Emotion” refers to a mental state like joy, sadness, love, reverence, anger or hate. Such emotions accompany deep changes in one's personal life: the emotion that OCCURS (*this sentence needs a verb*) at the birth of a first grandson, at the death of a best friend, in saying farewell to a son, or at the marriage of a daughter. It is not limited to enthusiasm or joyous feelings that accompany happy experiences. When you say "mood state", you are using the noun "mood" as an adjective. That is not wrong, but it is better to use an actual adjective like "mental". Since you list many states, you need to either use the plural "states" or use "like" as I did. Either "mental states like .... and hate" or "a mental state like ... or hate".

The word 'emotion' means a mood state such as joy, sadness, love, reverence, anger or hate. It means a deep change in the the way you feel like the emotion related to the birth of someone's first grandchild, the death of their best friend, saying goodbye to their child, or the marriage of their child. It does not only mean enthusiasm or excitment or something related to a happy experience.