No, the word 'gruesome' is an adjective, a word that describes a noun; for example a gruesome scene, a gruesome crime, etc.The noun form for the adjective gruesome is gruesomeness.
gruesome
I penetrated her rectum with gruesome force.
The word is spelled gruesome. The crime scene was described as "gruesome".
The African americans work as slaves was hard and gruesome.
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The pile of corpses left by the serial killer was a gruesome sight.
In medical terms the description of a hangover sounds even more gruesome.
Well, honey, you must have hit your head harder than a coconut falling from a palm tree. "Gruesome" is not a compound word, it's just a good ol' regular word all on its own. So, go ahead and add that to your vocabulary list and impress your friends with your newfound knowledge.
Gruesome, harsh, horrific, terribly redundant torture
The word "gruesome" is an adjective, therefore it is used to describe things, such as an object or a scenario. "Gruesome" has a very strong context and should not be used lightly. You could apply it to describing anything considered very horrible or grisly, often with undertones of fear or horror. Examples: "The murder scene was incredibly gruesome." "A gruesome slime monster crawled out of the murky pond."