The difference between Boon and Minus

When used as nouns, boon means a prayer, whereas minus means a minus sign (−).

When used as adjectives, boon means good, whereas minus means negative.

Minus is also preposition with the meaning: without.

Minus is also verb with the meaning: to subtract.

check bellow for the other definitions of Boon and Minus

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.

Minus as a preposition (informal):

Without.

Examples:

"I walked out minus my coat''."

"synonyms: lacking without"
Minus as a preposition (mathematics):

less; reduced by.

Examples:

"seven minus two is five"

"ant plus"

Minus as an adjective (mathematics):

Negative.

Examples:

"a minus number"
Minus as an adjective:

On the negative part of a scale.

Examples:

"minus seven degrees"
Minus as an adjective (postpositive):

Ranking just below a designated rating.

Examples:

"He got a grade of B minus for his essay."