Revelation does NOT have to use the term "Antichrist" or "Man of Sin" or "Son of Perdition" or "Little Horn". It is your duty to make all the valid connections between these terms and see that they all speak about the same person. So if you wish to find a link which makes all the connections, study the period of time assigned to the Antichrist in Daniel and Revelation. Both books speak of 1260 days, 42 months, 3 1/2 years. time, times, and half a time (or the dividing of time), "a week" (heptad) and "the midst of a week". And that is exactly half of seven years.
There are lots of different times of 3 1/2 years in the bible thats why they are named differently ex 1260 days, 42 months, 3 1/2 years time, times, and half a time
The antichrist is a deceiving spirt more than one and have already been on the earth just as John says below in the only verses in the bible that use the term antichrist
1 John 2:18
18 Dear children, this is the last hour; and as you have heard that the antichrist is coming, even now many antichrists have come. This is how we know it is the last hour.
1 John 2:22
22 Who is the liar? It is whoever denies that Jesus is the Christ. Such a person is the antichrist—denying the Father and the Son.
1 John 4:3
3 but every spirit that does not acknowledge Jesus is not from God. This is the spirit of the antichrist, which you have heard is coming and even now is already in the world.
2 John 1:7
I say this because many deceivers, who do not acknowledge Jesus Christ as coming in the flesh, have gone out into the world. Any such person is the deceiver and the antichrist.
When you read these descriptions of the antichrist above you will see that they describe something completely different from what we read about the sea beast or the man of sin or the little horn thus they are not the same.
What I am saying is exactually what the bible says so I am not bringing confusion as you claim I am saying what the bible teaches.
If you read the gospel of John you will see that John's description of the antichrist perfectly matches Jesus description of apostate Israel. Apostate Israel was already in the world at John's time and they denied that Jesus was the Christ and came from God and Jesus said that because of that they also denied the Father.
Thus the antichrist is deceiving spirt which denies Jesus as God and the man of sin or the little horn or even the sea beast of revelation is a self glorifying persecuting destroying being so I did do my duty.