Difference between Pessimist and Gloom

PESSIMIST vs GLOOM: NOUN

Someone who given a choice of outcomes, believes the worst is more likely.
One who looks on the dark side of things.
One who advocates the doctrine of pessimism; -- opposed to optimist.
One who exaggerates the evils of life or is disposed to see only its dark side; one who is given to melancholy or depressing views of life.
A person who expects the worst
One who accepts the metaphysical doctrine of pessimism, in either sense.

An atmosphere of depression and melancholy
Partial or total darkness; dimness.
A partially or totally dark place, area, or location.
An atmosphere of melancholy or depression.
A state of melancholy or depression; despondency.
A state of partial or total darkness
A feeling of melancholy apprehension
Dim, glimmering shade; deep twilight; cheerless obscurity; darkness: as, the gloom of a forest.
Hence — A dark place.
Cloudiness or heaviness of mind; dejection, melancholy, sullenness, and the like, or an aspect indicative of such feelings.
A depressing or disheartening condition of affairs; a dismal aspect or prospect.
In gunpowder-manuf., the drying-oven.
Partial or total darkness; thick shade; obscurity.
A shady, gloomy, or dark place or grove.
Cloudiness or heaviness of mind; melancholy; aspect of sorrow; low spirits; dullness.
In gunpowder manufacture, the drying oven.
Darkness, dimness or obscurity.
A melancholy, depressing or despondent atmosphere

To make dark, shaded, or obscure.
To make despondent; sadden.
To be or become dark, shaded, or obscure.
To feel, appear, or act despondent, sad, or mournful.
To become dark or dim; to be or appear dismal, gloomy, or sad; to come to the evening twilight.
To shine or appear obscurely or imperfectly; to glimmer.

To appear dimly; be seen in an imperfect or waning light; glimmer; be in darkness or obscurity.
To exhibit or produce a somber or melancholy feeling; appear sad, gloomy, or dismal; frown; lower.
To darken, or make dark, gloomy, or somber.
To fill with gloom or despondency; make gloomy or sad.

Prognosticator, Idealist, Dreamer, Worrier, Hater, Curmudgeon, Doomsayer, Skeptic, Naysayer, Fatalist, Realist, Cynic, Optimist, Crapehanger, Gloom

Pessimist, Unhappiness, Darkness, Sadness, Murk, Sombre, Drear, Hopelessness, Misery, Despair, Pessimism, Sombreness, Somberness, Glumness, Gloominess

Sentimentalist, Prognosticator, Idealist, Dreamer, Hater, Curmudgeon, Doomsayer, Skeptic, Naysayer, Fatalist, Realist, Cynic, Optimist, Crapehanger, Gloom

Dark, Sorrow, Grief, Pessimist, Unhappiness, Darkness, Sadness, Murk, Sombre, Drear, Hopelessness, Misery, Despair, Sombreness, Gloominess

In other words how would a pessimist define our democracy?
This makes it highly possible that Niko is a pessimist.
The extreme pessimist says do nothing because integration is impossible.
The pessimist says, "My cup runneth over, what a mess.".
His work is characterized by the pessimist he was.
Would you consider yourself a pessimist or an optimist?
Nurkse opposed import substitution but was an export pessimist.
For example, are they an optimist or pessimist?
Expect to fail, says the pessimist, try anyway.
Can he, in short, be at once not only a pessimist and an optimist, but a fanatical pessimist and a fanatical optimist?