Yes, the word hoax is an abstract noun; a word for a deception. A hoax is an abstract concept.
No, hoax can be a verb or a noun. When used before other nouns (hoax letter, hoax caller) it is acting as a noun adjunct.
hoaxes The plural of hoax is hoaxes.
No. Both words are synonyms. True Hoax would be an oxymoron.
A Fraud
A hoax is a deliberate attempt to dupe, deceive or trick an audience into believing, or accepting, that something is real, when the hoaxster knows it is not; or that something is true, when it is false.
You can use it as a noun: The climate in this nation is nice. My geography always talks about the climate of the country that we are studying. You can use it as an adjective: Some think that climate change is a hoax. Others think that the threat of climate change is dangerous.
The duration of The Hoax is 1.93 hours.
There was no hoax, the landings were real.
It was not a hoax, it was real.
Bigfoot is hoax.
There was no moon hoax. The moon landings were real.
The ISBN of Beyond the Hoax is 0199239207.
Beyond the Hoax was created in 2008.
The Hoax was released on 04/06/2007.
The Production Budget for The Hoax was $25,000,000.
It was somewhat, unfortuantley, a hoax.
Bathtub hoax was created in 1917.
The Hoax was created on 2007-04-06.