Euphemism (N): A figure of speech in which an offensive, harsh or blunt word or expression is avoided and one that is milder but precise or accurate is used instead.
This word can be broken as "eu" which means, "good, well" + "pheme", "speaking", some more cognates of the root "eu" are eulogy (eu good + logos, discourse, i.e. to say something good about someone, which means to applaud), eugeny (nobleness if birth, can be split as good + birth), euphony (literally means good sounding, some more cognates, cacophony), euthansia (mercy killing).
Example:
Instead of saying that he died, we say he passed away.
Blasphemy (N): profane talk of something supposed to be sacred, profaneness, sacrilege, irreverence, impiety.
The word can be split up as "blas" + "pheme" speaking.
Contextual example:
When Copernicus propounded the theory of heliocentric cosmology, everyone considered it as blasphemy.
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