earth vs ground

earth and ground both are nouns.

Word	Noun	Adjective	Verb	Adverb
earth	Yes	No	Yes	No
ground	Yes	No	Yes	No

As nouns, earth and ground are synonyms defined as:

earth and ground: a connection between an electrical device and a large conducting body, such as the earth (which is taken to be at zero voltage)

As nouns, earth and ground are synonyms defined as:

Other synonyms of earth include dry land, land, solid ground, terra firma.

As nouns, earth and ground are synonyms defined as:

earth and ground: the loose soft material that makes up a large part of the land surface

As verbs, ground is a hypernym of earth; that is, ground is a word with a broader meaning than earth:

earth (noun)	ground (noun)
a connection between an electrical device and a large conducting body, such as the earth (which is taken to be at zero voltage)	the first or preliminary coat of paint or size applied to a surface
the concerns of this life as distinguished from heaven and the afterlife	(art) the surface (as a wall or canvas) prepared to take the paint for a painting
the abode of mortals (as contrasted with Heaven or Hell)	a connection between an electrical device and a large conducting body, such as the earth (which is taken to be at zero voltage)
the solid part of the earth's surface	the part of a scene (or picture) that lies behind objects in the foreground
the 3rd planet from the sun; the planet we live on	a relatively homogeneous percept extending back of the figure on which attention is focused
the loose soft material that makes up a large part of the land surface	a position to be won or defended in battle (or as if in battle)
once thought to be one of four elements composing the universe (Empedocles), associated with the humour black bile	a rational motive for a belief or action
	the solid part of the earth's surface
	material in the top layer of the surface of the earth in which plants can grow (especially with reference to its quality or use)
	a relation that provides the foundation for something
	the loose soft material that makes up a large part of the land surface

earth (verb)	ground (verb)
connect to the earth	use as a basis for; found on
hide in the earth like a hunted animal	instruct someone in the fundamentals of a subject
	place or put on the ground
	confine or restrict to the ground
	connect to a ground
	cover with a primer; apply a primer to
	fix firmly and stably
	(baseball) a hit that travels along the playing field.
	throw to the ground in order to stop play and avoid being tackled behind the line of scrimmage
	hit or reach the ground
	bring to the ground