As nouns the difference between perse and herse

is that perse is a dark greyish blue colour while herse is a kind of gate or portcullis, having iron bars, like a harrow, studded with iron spikes, hung above gateways so that it may be quickly lowered to impede the advance of an enemy.

As proper nouns the difference between perse and herse

is that perse is an Oceanid, (one of the three thousand daughters of the Titans' Oceanus and Tethys), and the wife of the sun god, Helios, with who she is the mother of Aeetes, Perses, Pasiphae and Circe. One of her many sisters is Amphitrite, (the wife of Poseidon). Perse is also closely identified with Hecate while Herse is one of the moons of Jupiter.

As an adjective perse

is dark greyish blue or purple.

As a verb herse is

alternative form of lang=en.