sheet vs tangent plane

sheet and tangent plane both are nouns.

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

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

sheet: (mathematics) an unbounded two-dimensional shape
tangent plane: the plane that contains all the lines tangent to a specific point on a surface

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

sheet (noun)	tangent plane (noun)
bed linen consisting of a large rectangular piece of cotton or linen cloth; used in pairs	the plane that contains all the lines tangent to a specific point on a surface
(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)	tangent plane (verb)
cover with a sheet, as if by wrapping
come down as if in sheets