sheet vs orbital plane

sheet and orbital plane both are nouns.

Word	Noun	Adjective	Verb	Adverb
sheet	Yes	No	Yes	No
orbital plane	Yes	No	No	No

As nouns, orbital plane is a hyponym of sheet; that is, orbital plane is a word with a more specific, narrower meaning than sheet:

Other hyponyms of sheet include Cartesian plane, facet plane, midline, midplane, picture plane, tangent plane.

sheet (noun)	orbital plane (noun)
bed linen consisting of a large rectangular piece of cotton or linen cloth; used in pairs	(astronomy) the plane on which a body is orbiting
(nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind
a flat artifact that is thin relative to its length and width
a large piece of fabric (usually canvas fabric) by means of which wind is used to propel a sailing vessel
paper used for writing or printing
newspaper with half-size pages
any broad thin expanse or surface
(mathematics) an unbounded two-dimensional shape

sheet (verb)	orbital plane (verb)
cover with a sheet, as if by wrapping
come down as if in sheets