What is the difference between oxymoron and antiphrasis? give examples

An antiphrasis is a word or group of words used in place of their antonyms; I think such use is usually intended to be rude or funny.

I found examples on the Internet, such as referring to a big-muscled man as "tiny."

source: 

http://www.softschools.com/examples/literary_terms/antiphrasis_examples//

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An oxymoron is a phrase with two words with opposite meanings.

I found examples on the Internet:

http://examples.yourdictionary.com/examples-of-oxymorons.html

Antiphrasis : This giant of3 feet4 inches (Merriam Webster Dictionary)

Oxymoron: Standard deviation

Oxymora might seem stupid or nonsensical on the surface, but they carry a subtler meaning when examined in depth.