The difference between Bane and Boon

When used as nouns, bane means a cause of misery or death, whereas boon means a prayer.

Bane is also verb with the meaning: to kill, especially by poison.

Boon is also adjective with the meaning: good.

check bellow for the other definitions of Bane and Boon

Bane as a noun:

A cause of misery or death; an affliction or curse.

Examples:

"the bane of my existence"
Bane as a noun (dated):

Poison, especially any of several poisonous plants.
Bane as a noun (obsolete):

A killer, murderer, slayer.
Bane as a noun (obsolete):

Destruction; death.
Bane as a noun:

A disease of sheep; the rot.

Bane as a verb (transitive):

To kill, especially by poison; to be the poison of.
Bane as a verb (transitive):

To be the bane of.

Boon as a noun (obsolete):

A prayer; petition.
Boon as a noun (archaic):

That which is asked or granted as a benefit or favor; a gift or benefaction.
Boon as a noun:

A good thing; a blessing or benefit; a thing to be thankful for.

Examples:

"Finding the dry cave was a boon to the weary travellers."

"Anaesthetics are a great boon to modern surgery."
Boon as a noun (UK, _, dialectal):

An unpaid service due by a tenant to his lord.

Boon as an adjective (obsolete):

good; prosperous; as, "boon voyage"
Boon as an adjective:

kind; bountiful; benign
Boon as an adjective:

(Fossil word used only in idiom pairing it with subsequent "companion") gay; merry; jovial; convivial

Boon as a noun:

The woody portion of flax, separated from the fiber as refuse matter by retting, braking, and scutching.