Yes it can be but mostly it is used as a noun.
As a verb it can mean:
1.To make or become dim or indistinct:
• obscure, blur, fade, film, fog, haze, mist,
2.To be sullenly aloof or withdrawn:
• sulk, lower, brood, mope, pet, pout
The word gloom is a noun.
The answer was in the cementery's gloom
The suffix of the word "gloom" is -m.
blahs, blues, slump
Another word for morbidity is gloom.
bright lovly moonlight
Sad and melancholy are examples.
The word 'cloud' is a verb and a noun.The noun cloud is a word for a visible mass of condensed water vapor or other particles; a word for a large number of flying insects moving together; a word for a state or cause of gloom, suspicion, trouble, or worry; a word for a thing.Examples:There wasn't a single cloud in the sky. (noun)Don't let his opinion cloud your own judgement. (verb)
There are many synonyms for the word "gloom" including sad, dreary, dark, anguish, bitterness, blue, depression, horror, malaise, sadness, and sorrow.
melancholy
It is a gloomy day today!
gloomydullmoral blindnessdeepness of shade or colourobscurityintellectualcalamity