What word can be used instead of apart?

The best substitute for "apart" depends on the context. Here are some options based on different meanings of "apart":

To separate or divide:

* Separate

* Divide

* Distinguish

* Disunite

* Sever

* Split

* Disengage

* Isolate

* Break up

* Disassociate

To be at a distance:

* Away

* Distant

* Remote

* Separate

* Asunder

* Aloof

* Apart from

To be different:

* Distinct

* Different

* Unlike

* Unalike

* Separate

In a relationship or argument:

* At odds

* Disagreeable

* Unreconciled

* Estranged

In a phrase like "fall apart":

* Disintegrate

* Collapse

* Break down

* Crumble

* Decompose

To be unable to function:

* Dysfunctional

* Broken

* Defective

To give you the most accurate replacement, please provide me with the sentence or context where you're using "apart."