In geometry terms the difference between polyhedron and disphenoid

is that polyhedron is a solid figure with many flat faces and straight edges while disphenoid is a polyhedron whose four faces are identical isosceles or scalene triangles.

As an adjective disphenoid is

describing a wedge-shaped crystal form of the tetragonal or orthorhombic system.

As a verb face

is .

As an adjective disphenoid is

(mineralogy) describing a wedge-shaped crystal form of the tetragonal or orthorhombic system.

As a noun disphenoid is

(geometry) a polyhedron whose four faces are identical isosceles or scalene triangles.

In geometry|lang=en terms the difference between isosceles and disphenoid

is that isosceles is (geometry) having two sides of equal length, used especially of an isosceles triangle or isosceles trapezoid while disphenoid is (geometry) a polyhedron whose four faces are identical isosceles or scalene triangles.

As adjectives the difference between isosceles and disphenoid

is that isosceles is (geometry) having two sides of equal length, used especially of an isosceles triangle or isosceles trapezoid while disphenoid is (mineralogy) describing a wedge-shaped crystal form of the tetragonal or orthorhombic system.

As a noun disphenoid is

(geometry) a polyhedron whose four faces are identical isosceles or scalene triangles.

As nouns the difference between sister and sistergirl

is that sister is a daughter of the same parents as another person; a female sibling while sistergirl is sister, girlfriend (as a familiar term of address between women).

As a verb sister

is to strengthen (a supporting beam) by fastening a second beam alongside it.

As nouns the difference between carbonate and nesquehonite

is that carbonate is any salt or ester of carbonic acid while nesquehonite is magnesium carbonate trihydrate.

As a verb carbonate

is to charge (often a beverage) with carbon dioxide.

As nouns the difference between trihydrate and nesquehonite

is that trihydrate is a hydrate whose solid contains three molecules of water of crystallization per molecule, or per unit cell while nesquehonite is magnesium carbonate trihydrate.

As nouns the difference between scientist and meteoriticist

is that scientist is one whose activities make use of the scientific method to answer questions regarding the measurable universe a scientist may be involved in original research, or make use of the results of the research of others while meteoriticist is a scientist involved in meteoritics.

As nouns the difference between meteoritics and meteoriticist

is that meteoritics is (astronomy) a science that deals with meteors and meteorites while meteoriticist is a scientist involved in meteoritics.

As nouns the difference between magnesium and niningerite

is that magnesium is magnesium while niningerite is (mineralogy) a magnesium-iron-manganese sulfide mineral.

As nouns the difference between iron and niningerite

is that iron is pencil while niningerite is (mineralogy) a magnesium-iron-manganese sulfide mineral.