The difference between Deny and Reject

When used as verbs, deny means to not allow, whereas reject means to refuse to accept.

Reject is also noun with the meaning: something that is rejected.

check bellow for the other definitions of Deny and Reject

Deny as a verb (transitive):

To not allow.

Examples:

"I wanted to go to the party, but I was denied."
Deny as a verb (transitive):

To assert that something is not true.

Examples:

"I deny that I was at the party."

"Everyone knows he committed the crime, but he still denies it."
Deny as a verb (transitive):

To disallow
Deny as a verb (transitive):

to refuse to give or grant something to someone

Examples:

"My father denied me a good education."
Deny as a verb (sports, transitive):

To prevent from scoring.
Deny as a verb:

To disclaim connection with, responsibility for, etc.; to refuse to acknowledge; to disown; to abjure; to disavow.
Deny as a verb (obsolete):

To refuse (to do or accept something).

Reject as a verb (transitive):

To refuse to accept.

Examples:

"She even rejected my improved offer."
Reject as a verb (basketball):

To block a shot, especially if it sends the ball off the court.
Reject as a verb:

To refuse a romantic advance.

Examples:

"I've been rejected three times this week."

Reject as a noun:

Something that is rejected.
Reject as a noun (derogatory, _, slang):

An unpopular person.
Reject as a noun (colloquial):

a rejected defective product in a production line