The difference between Boo-boo and Fluff

When used as nouns, boo-boo means a mistake or error, whereas fluff means anything light, soft or fuzzy, especially fur, hair, feathers.

When used as verbs, boo-boo means to defecate, whereas fluff means to make something fluffy.

check bellow for the other definitions of Boo-boo and Fluff

Boo-boo as a noun (countable, colloquial, often, childish):

A mistake or error.
Boo-boo as a noun (countable, colloquial, childish, by or to young children):

A minor injury, such as a cut or a bruise.
Boo-boo as a noun (uncountable, colloquial, childish, by or to young children):

Feces.

Boo-boo as a verb (colloquial, childish, by or to young children):

To defecate.

Fluff as a noun:

Anything light, soft or fuzzy, especially fur, hair, feathers.
Fluff as a noun:

Anything inconsequential or superficial.

Examples:

"That article was basically a bunch of fluff. It didn't say anything substantive."
Fluff as a noun:

Lapse, especially a mistake in an actor's lines.
Fluff as a noun (New England):

Marshmallow creme.
Fluff as a noun (LGBT):

A passive partner in a lesbian relationship.
Fluff as a noun (Australia, euphemistic):

A fart.

Fluff as a verb (transitive):

To make something fluffy.

Examples:

"The cat fluffed its tail."
Fluff as a verb (intransitive):

To become fluffy, puff up.
Fluff as a verb (intransitive):

To move lightly like fluff.

Examples:

"rfquotek Holmes"
Fluff as a verb (transitive, intransitive, of an actor or announcer):

To make a mistake in one's lines.
Fluff as a verb (transitive):

To do incorrectly, for example mishit, miskick, miscue etc.
Fluff as a verb (intransitive, Australia, euphemistic):

To fart.
Fluff as a verb (transitive, slang):

To arouse (a male pornographic actor) before filming.