I can see how non English speakers confuse the two as they are referred to in the Bible.
anti Christ- descriptor, against Christ.
The Antichrist. An individual who rises to power and in opposition of Christ
It can help to read the whole Bible because it provides context. The Bible refers to itself 40,000 times in order to provide clarification.
For example, Christ saying ‘my God,my God, why have you forsaken me?’ Is often cherry picked by Muslims, Jews and atheists who have no contextual understanding, when Christ was referring on the cross that he was fulfilling the prophecy of the 22nd psalm.
To be anti Christ can be anybody. To be the Antichrist will be just one.