irreplaceable

As adjectives the difference between unrepeatable and irreplaceable

is that unrepeatable is unable to be repeated while irreplaceable is that cannot be replaced.

As an adjective irreplaceable

is that cannot be replaced.

As a letter x is

the twenty-fourth letter of the.

As a symbol x is

voiceless velar fricative.

As adjectives the difference between irreplaceable and valuable

is that irreplaceable is that cannot be replaced while valuable is having a great value.

As a noun valuable is

a personal possession such as jewellery, of relatively great monetary value; — usually used in plural form.

As adjectives the difference between irreplaceable and undefined

is that irreplaceable is that cannot be replaced while undefined is lacking a definition or value.

As adjectives the difference between irreplaceable and expendable

is that irreplaceable is that cannot be replaced while expendable is able to be expended; not inexhaustible.

As a noun expendable is

an expendable person or object; usually used in the plural.

As a verb substitute

is to use in place of something else, with the same function.

As a noun substitute

is a replacement or stand-in for something that achieves a similar result or purpose.

As an adjective irreplaceable is

that cannot be replaced.

As adjectives the difference between unique and irreplaceable

is that unique is being the only one of its kind; unequaled, unparalleled or unmatched while irreplaceable is that cannot be replaced.

As a noun unique

is a thing without a like; something unequalled or unparallelled.

As adjectives the difference between irreplicable and irreplaceable

is that irreplicable is incapable of being replicated while irreplaceable is that cannot be replaced.

As adjectives the difference between irreplaceable and nonreplaceable

is that irreplaceable is that cannot be replaced while nonreplaceable is not replaceable, unable to be replaced.

As adjectives the difference between irreplaceable and outstanding

is that irreplaceable is that cannot be replaced while outstanding is prominent or noticeable; standing out from others.