Synonyms for Earth:

adj.

land (adjective)
coastal, land, mainland, shore, ground, beach.

n.

Earth (noun)
globe, earthly concern, ground, world, worldly concern.
grit, sphere, alluvium. coil, diaphragm, loam, muck, clay, contact, circuitry, turf, dirt, terrain, circuit, sand, gravel, anode, mud, circuit board, subsoil, conduit, mold, surface, compost, circuit breaker, cathode, fill. calm down, asteroid, cluster, celestial object, awake, comet, quit dreaming, black hole, constellation, the Big Dipper, be sensible, cosmic dust, antimatter, dark matter. habitat, lair, molehill, rabbit warren, den, burrow, lodge, place, bedding, nest. the globe, the world, homo sapiens, the planet, the earth, culture, flesh, Mother Earth. artifact (noun)
ground.
dust (noun)
sand.
ground, soil (noun)
fill, dirt, gravel, clay, loam, muck, sand, mold, mud, land, shore, terrain, subsoil, coast, surface, alluvium, turf, compost.
land (noun)
ground, land, shore, terra firma, coast, beach, mainland, stone, bank, soil.
object (noun)
globe, world.
substance (noun)
ground.
the world (noun)
globe, cosmos, creation, terra firma, planet, universe, sphere.
universe (noun)
globe, heavens, planet, world, galaxy, creation, nature, universe, cosmos, plenum.

Other synonyms:

Earth
dirt.
clay, habitat, alluvium, sand, subsoil, bedding, grit, molehill, homo sapiens. flesh, den, lair, mud, rabbit warren. burrow, turf. lodge. nest. topsoil
loam.
Other relevant words:
compost, place, nest, bedding, surface, comet, turf, diaphragm, mold, muck, coil, circuitry, contact, alluvium, cluster, sand, dirt, den, fill, habitat, lodge, cathode, earthly concern, grit, loam, worldly concern, lair, the earth, molehill, the world, terrain, conduit, mud, flesh, sphere, circuit, Mother Earth, constellation, burrow, clay, awake, homo sapiens, subsoil, culture, anode, gravel, asteroid, antimatter.

Usage examples for earth

  1. " How on earth he began. – 'Firebrand' Trevison by Charles Alden Seltzer
  2. What on earth was the man doing? – Love Me Little, Love Me Long by Charles Reade Edition: 10 Language: English
  3. Why, what on earth can you mean? – Captivating Mary Carstairs by Henry Sydnor Harrison