WordNet sense 1 (the loose soft material that makes up a large part of the land surface):

earth

WordNet sense 2 (a relation that provides the foundation for something):

threaten, footing

WordNet sense 3 (material in the top layer of the surface of the earth in which plants can grow (especially with reference to its quality or use)):

soil, land

WordNet sense 4 (the solid part of the earth's surface):

dry land, terra firma, solid ground

WordNet sense 5 (a rational motive for a belief or action):

reason

WordNet sense 6 (the part of a scene (or picture) that lies behind objects in the foreground):

background

WordNet sense 7 (the first or preliminary coat of paint or size applied to a surface):

primer, priming, undercoat, primer, flat coat, primer coat, priming coat

WordNet sense 8 (bring to the ground):

run aground

WordNet sense 9 (cover with a primer; apply a primer to):

prime

WordNet sense 10 (fix firmly and stably):

anchor

WordNet sense 11 (use as a basis for; found on):

base, establish, found