Vearth

Vearth (大地 (ヴァース), Vāsu, Great Earth (Kanji), Varse in the Viz Manga and in the edited dub) is an alternate name giving to simple dirt by the people of Skypea. Dirt isn't commonly found on the sky islands that are made mostly of dirt, so when the Skypieans find dirt they believe it to be sacred. "Vearth" can be found in Skypea on the Upper Yard.

Before the Skypiea Arc, the Shandian Aisa would usually sneak into Upper Yard and fill up her bag with Vearth, bringing it back home with her.

The dirt on Upper Yard and Upper Yard itself originates from the island Jaya directly below Skypea. Originally Upper Yard was mearly a piece of the island, but after a Knock Up Stream appeared beneath Jaya, it was shot up to Skypea never to be seen again by the blue sea world.

Fairy Vearth
Fairy Vearth (限りない大地, (フェアリーヴァース) Endless Great Earth" (Kanji) Fearī Vāsu, Endless Vearth in the FUNimation dub and Endless Varse in the Viz Manga) is a legendary land that Enel mention throughout the Skypea arc. Enel wanted to travel to Fairy Vearth after he destroys Skypea, he wanted to travel in his flying golden ship.

After being defeated by Luffy, Enel headed off to Fairy Vearth, which is actuall the Moon. There he found a group of alien like creatures who have wings similar to like the Skypieans, which Enel befriended.

The discrepancy in translation ("Endless" Vs "Fairy") is because both are actually written in the manga. The Kanji written lists it as "Endless Great Earth" while the Furigana reading is for "Fairy Vearth", meaning technically, both are correct.