These are other words, which
have the prefix eu-
(good).
1) euphoria:
Good mood and exaggerated happiness.
2) euphemism:
The use of a word, that is less expressive or direct but considered less
offensive than another.
Ex: if we use "senior citizen" instead of "old man", It is an
euphemism.
Some
other euphemisms are "departed" for "dead", "remains" for "corpse(dead
body)"
3) euthanasia:
(thanasia=death) The act of killing someone
painlessly, esp.to relieve suffering from an incurable
illness.