Modify vs Alleviate - What's the difference?

In lang=en terms the difference between modify and alleviate

is that modify is to be or become modified while alleviate is to make less severe, as a pain or difficulty.

is that modify is to make partial changes to while alleviate is to make less severe, as a pain or difficulty.

(en-verb)

To make partial changes to.

To be or become modified.

* adapt, alter, amend, revamp, rework

* *

To make less severe, as a pain or difficulty.

Alcohol is often a cheap tool to alleviate the stress of a hard day.

* address, allay, ameliorate, assuage, ease, mitigate, relieve