The difference between Odd and Unusual

When used as nouns, odd means an , whereas unusual means something that is unusual.

When used as adjectives, odd means single, whereas unusual means unlike what is expected.

check bellow for the other definitions of Odd and Unusual

Odd as an adjective (not comparable):

Single; sole; singular; not having a mate.

Examples:

"Optimistically, he had a corner of a drawer for odd socks."
Odd as an adjective (obsolete):

Singular in excellence; unique; sole; matchless; peerless; famous.
Odd as an adjective:

Singular in looks or character; peculiar; eccentric.
Odd as an adjective:

Strange, unusual.

Examples:

"She slept in, which was very odd."
Odd as an adjective (not comparable):

Occasional; infrequent.

Examples:

"but for the odd exception"
Odd as an adjective (not comparable):

Left over, remaining when the rest have been grouped.

Examples:

"I'm the odd one out."
Odd as an adjective (not comparable):

Casual, irregular, not planned.

Examples:

"He's only worked odd jobs."
Odd as an adjective (not comparable, in combination with a number):

About, approximately.

Examples:

"There were thirty-odd people in the room."
Odd as an adjective (not comparable):

Indivisible by two; not even.

Examples:

"The product of odd numbers is also odd."
Odd as an adjective:

Sporadic; scattered in frequency; occurring randomly

Examples:

"I don't speak Latin well, so in hearing a dissertation in Latin, I would only be able to make out the odd word of it."
Odd as an adjective (sports):

On the left.

Examples:

"He served from the odd court. "

Odd as a noun (mathematics, diminutive):

An .

Examples:

"So let's see. There are two evens here and three odds."
Odd as a noun (colloquial):

Something left over, not forming part of a set.

Examples:

"I've got three complete sets of these [[trading card]]s for sale, plus a few dozen odds."

Unusual as an adjective:

Unlike what is expected; differing in some way from the norm.

Examples:

"His behavior was unusual in that it was considered childish for a man of his age."
Unusual as an adjective:

Not usual.