geosphere vs lithosphere

geosphere and lithosphere both are nouns.

Word	Noun	Adjective	Verb	Adverb
geosphere	Yes	No	No	No
lithosphere	Yes	No	No	No

As nouns, geosphere and lithosphere are synonyms defined as:

geosphere and lithosphere: the solid part of the earth consisting of the crust and outer mantle

geosphere (noun)	lithosphere (noun)
the solid part of the earth consisting of the crust and outer mantle	the solid part of the earth consisting of the crust and outer mantle