Anti-capitalist is an empty signifier for anarchists

 A stupid redundancy that opens the door for left-fascist manipulation and entrism

"  Soviet anarchism "

Antifascist however in its ANTIFA guise has a use as a synonym for the Black Bloc tactic.

Yar?

Now anticommunism might serve as a synonym for anticapitalist.

Since the worlds worst capitalist fascists are all CHEKISTS. 

Yes!?

Perhaps we should consult a tribal elder . . . 

https://www.marxists.org/archive/malatesta/1924/individualism-and-communism-in-anarchism.html

(I use the word ‘associationist’ as an alternative to the word ‘communist,’ not because I like pointless new jargon, but because I forsee the possibility that the communist anarchists will gradually abandon the term ‘communist’; it is growing in ambivalence and falling into disrepute as a result of Russian ‘communist’ despotism. If the term is eventually abandoned this will be a repetition of what happened with the word ‘socialist.’ 

We who, in Italy at least, were the first champions of socialism and maintained and still maintain that we are the true socialists in the broad and human sense of the word, ended by abandoning the term to avoid confusion with the many and various authoritarian and bourgeois deviations of socialism.

 Thus too we may have to abandon the term ‘communist’ for fear that our ideal of free human solidarity will be confused with the avaricious despotism which has for some while triumphed in Russia and which one party, inspired by the Russian example, seeks to impose worldwide.