earths
n. C / Un. the planet we live on, or the ground and soil under your feet. When used in the plural, it can refer to different types of soil or other planets like ours.
n. the planet inhabited by humans; the substance of the land surface; or specific varieties of soil. In the plural form, it typically refers to distinct types of soil or hypothetical terrestrial planets.
The gardener mixed several different earths to create the perfect potting soil.
Astronomers are searching distant star systems for other 'earths' that might support biological life.
The geologist categorized the various earths found in the valley, noting the high clay content in the lower strata compared to the sandy loam above.
When referring to the planet, it is usually singular and capitalized ('Earth'); as a common noun for soil or ground, it is lowercase and can be pluralized.