short selling vs short sale

short selling and short sale both are nouns.

Word	Noun	Adjective	Verb	Adverb
short selling	Yes	No	No	No
short sale	Yes	No	No	No

As nouns, short selling and short sale are synonyms defined as:

short selling and short sale: sale of securities or commodity futures not owned by the seller (who hopes to buy them back later at a lower price)

short selling (noun)	short sale (noun)
sale of securities or commodity futures not owned by the seller (who hopes to buy them back later at a lower price)	sale of securities or commodity futures not owned by the seller (who hopes to buy them back later at a lower price)