The Capulets and the Montagues of Romeo and Juliet.
Flash's arch enemies is the two zooms
Flash's arch enemies is the two zooms
The Samurai
the arnt
enemies
Captain America's biggest arch nemesis is the Red Skull, but he has many more enemies including Baron Zemo, Batroc the Leaper, Crossbones, HYDRA, and MODOK to name a few.
They weren't arch-enemies exactly, that would imply they had some equal standing against them. The ants were subservient to the grasshoppers but the main antagonists were Hopper & the Grasshoppers.
The arch of the bridge stretched gracefully across the river.
An arch rival or enemy might be your nemesis.
Christopher Marlowe
bwcause they are arch enemies
the answer is nemesis