Ecstatic, overjoyed.
abundant
Healthappy (healthy and happy)
surplus overabundance surfeit
yummy
Passion is the only word I can think of right off hand.
Adding "-er" to the end of the word "happy" changes the meaning to comparative form, indicating that someone/something is more happy than another person or thing. So, "happier" means more happy than something else.
The prefix "un-" could be added to the word happy to create the word "unhappy," which means not happy.
greatful is another word for happy
Majority means greater than half. Greater means more than.
Try the word Cherish
The word that means very great or much more than usual is "excessive."
abundant
endlessness
Less or more
Yearn
majority
Being unable to be happy means being Miserable