The difference between Extreme and Outermost

When used as nouns, extreme means the greatest or utmost point, degree or condition, whereas outermost means that which is outermost.

Extreme is also adverb with the meaning: extremely.

Extreme is also adjective with the meaning: of a place, the most remote, farthest or outermost.

check bellow for the other definitions of Extreme and Outermost

Extreme as an adjective:

Of a place, the most remote, farthest or outermost.

Examples:

"At the extreme edges, the coating is very thin."
Extreme as an adjective:

In the greatest or highest degree; intense.

Examples:

"He has an extreme aversion to needles, and avoids visiting the doctor."
Extreme as an adjective:

Excessive, or far beyond the norm.

Examples:

"His extreme love of model trains showed in the rails that criscrossed his entire home."
Extreme as an adjective:

Drastic, or of great severity.

Examples:

"I think the new laws are extreme, but many believe them necessary for national security."
Extreme as an adjective:

Of sports, difficult or dangerous; performed in a hazardous environment.

Examples:

"Television has begun to reflect the growing popularity of extreme sports such as bungee jumping and skateboarding."
Extreme as an adjective (archaic):

Ultimate, final or last.

Examples:

"the extreme hour of life"

Extreme as a noun:

The greatest or utmost point, degree or condition.
Extreme as a noun:

Each of the things at opposite ends of a range or scale.

Examples:

"'extremes of temperature"
Extreme as a noun:

A drastic expedient.
Extreme as a noun (mathematics):

Either of the two numbers at the ends of a proportion, as 1 and 6 in 1:2=3:6.

Outermost as an adjective:

Examples:

"He lived on the outermost edge of the city."

Outermost as a noun:

That which is outermost; the surface; the outside.