The difference between Buff and Burnish

When used as nouns, buff means undyed leather from the skin of buffalo or similar animals, whereas burnish means polish.

When used as verbs, buff means to polish and make shiny by rubbing, whereas burnish means to make smooth or shiny by rubbing.

Buff is also adjective with the meaning: of the color of buff leather, a brownish yellow.

check bellow for the other definitions of Buff and Burnish

Buff as a noun:

Undyed leather from the skin of buffalo or similar animals.
Buff as a noun:

A tool, often one covered with buff leather, used for polishing.
Buff as a noun:

A brownish yellow colour.

Examples:

"color paneF0DC82"
Buff as a noun:

A military coat made of buff leather.
Buff as a noun (informal):

A person who is very interested in a particular subject; an enthusiast.

Examples:

"He’s a real history buff. He knows everything there is to know about the [[civil war]]."
Buff as a noun (video games, RPG):

An effect that makes a character or item stronger.

Examples:

"I just picked up an epic damage buff! Let's go gank the other team!"
Buff as a noun (rail transport):

Compressive coupler force that occurs during a slack bunched condition.
Buff as a noun:

The bare skin.

Examples:

"to strip to the buff"
Buff as a noun:

The greyish viscid substance constituting the buffy coat.
Buff as a noun:

A substance used to dilute (street) drugs in order to increase profits.

Buff as an adjective:

Of the color of buff leather, a brownish yellow.
Buff as an adjective (bodybuilding):

Unusually muscular. (also buffed or buffed out)

Examples:

"The bouncer was a big, buff dude with tattoos, a shaved head, and a serious scowl."
Buff as an adjective (slang):

Physically attractive.

Buff as a verb:

To polish and make shiny by rubbing.

Examples:

"He was already buffing the car's hubs."
Buff as a verb (video games, RPG):

To make a character or an item stronger.

Examples:

"The enchanter buffed the paladin to prepare him to fight the dragon."

"I noticed that the pistols were buffed in the update."
Buff as a verb (medical slang):

To modify a medical chart, especially in a dishonest manner.

Burnish as a verb (transitive):

To make smooth or shiny by rubbing; to polish; to shine.

Examples:

"In pottery, a stone is sometimes used to burnish a pot before firing, giving it a smooth, shiny look."
Burnish as a verb (intransitive):

To shine forth; to brighten; to become smooth and glossy, as from swelling or filling out; hence, to grow large.