The difference between Exceptional and Usual

When used as adjectives, exceptional means forming an exception, whereas usual means most commonly occurring.

Exceptional is also noun with the meaning: an exception, or something having an exceptional value.

check bellow for the other definitions of Exceptional and Usual

Exceptional as an adjective:

Forming an exception; not ordinary; uncommon; rare.

Examples:

"What an exceptional flower!"
Exceptional as an adjective:

Better than the average; superior due to exception or rarity.

Examples:

"The quality of the beer was exceptional."
Exceptional as an adjective (geometry):

Corresponding to something of lower dimension under a birational correspondence.

Examples:

"an exceptional curve; an exceptional divisor"

Exceptional as a noun:

An exception, or something having an exceptional value

Usual as an adjective:

Most commonly occurring; typical.

Examples:

"The preference of a boy to a girl is a usual occurrence in some parts of China."

"It is becoming more usual these days to rear children as bilingual."