The difference between Irk and Vex

When used as verbs, irk means to irritate, whereas vex means to trouble aggressively, to harass.

Vex is also noun with the meaning: a trouble.

check bellow for the other definitions of Irk and Vex

Irk as a verb (transitive):

to irritate; annoy; bother

Examples:

"It irks me doing all this work and have someone [[wreck]] it."

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.