spherical geometry vs geometry

spherical geometry and geometry both are nouns.

Word	Noun	Adjective	Verb	Adverb
spherical geometry	Yes	No	No	No
geometry	Yes	No	No	No

As nouns, geometry is a hypernym of spherical geometry; that is, geometry is a word with a broader meaning than spherical geometry:

spherical geometry: (mathematics) the geometry of figures on the surface of a sphere
geometry: the pure mathematics of points and lines and curves and surfaces

spherical geometry (noun)	geometry (noun)
(mathematics) the geometry of figures on the surface of a sphere	the pure mathematics of points and lines and curves and surfaces