The difference between Irritate and Vex

When used as verbs, irritate means to provoke impatience, anger, or displeasure in, whereas vex means to trouble aggressively, to harass.

Vex is also noun with the meaning: a trouble.

check bellow for the other definitions of Irritate and Vex

Irritate as a verb (transitive):

To provoke impatience, anger, or displeasure in.
Irritate as a verb (intransitive):

To cause or induce displeasure or irritation.
Irritate as a verb (transitive):

To induce pain in (all or part of a body or organism).
Irritate as a verb (transitive, obsolete, Scotland, legal):

To render null and void.

Examples:

"rfquotek Archbishop Bramhall"

Vex as a verb (transitive, now, _, rare):

To trouble aggressively, to harass.
Vex as a verb (transitive):

To annoy, irritate.

Examples:

"Billy's professor was vexed by his continued failure to improve his [[grade]]s."
Vex as a verb (transitive):

To cause (mental) suffering to; to distress.
Vex as a verb (transitive, rare):

To twist, to weave.
Vex as a verb (intransitive, obsolete):

To be irritated; to fret.

Examples:

"rfquotek Chapman"
Vex as a verb (transitive):

To toss back and forth; to agitate; to disquiet.