The difference between Ultimate and Uttermost

When used as nouns, ultimate means the most basic or fundamental of a set of things, whereas uttermost means the utmost.

When used as adjectives, ultimate means final, whereas uttermost means outermost.

Ultimate is also verb with the meaning: to finish.

check bellow for the other definitions of Ultimate and Uttermost

Ultimate as an adjective:

Final; last in a series.
Ultimate as an adjective (of a syllable):

Last in a word or other utterance.
Ultimate as an adjective:

Being the greatest possible; maximum; most extreme.

Examples:

"the ultimate pleasure"

"the ultimate disappointment"
Ultimate as an adjective:

Being the most distant or extreme; farthest.
Ultimate as an adjective:

That will happen at some time; eventual.
Ultimate as an adjective:

Last in a train of progression or consequences; tended toward by all that precedes; arrived at, as the last result; final.
Ultimate as an adjective:

Incapable of further analysis; incapable of further division or separation; constituent; elemental.

Examples:

"an ultimate constituent of matter"

Ultimate as a noun:

The most basic or fundamental of a set of things
Ultimate as a noun:

The final or most distant point; the conclusion
Ultimate as a noun:

The greatest extremity; the maximum
Ultimate as a noun (uncountable):

A non-contact competitive team sport played with a 175 gram flying disc, the object of which is to score points by passing the disc to a player in the opposing end zone.

Examples:

"pedialite Ultimate (sport)"

Uttermost as an adjective:

Outermost.
Uttermost as an adjective:

Extreme; utmost; of the farthest, greatest, or highest degree.

Uttermost as a noun:

The utmost; the highest or greatest degree; the farthest extent.