Solar, for instance, is less useful in the long dark night of the northern winter.Washington Post (Aug 14, 2015) sol (sun) + ar (suffix forming adjectives) As the roots and definition show, the word should be an adjective, but the example sentence uses it as a shortened form of the noun phrase solar energy..
Disproportionality is the overrepresentation of a particular race or cultural group in a program or system compared to their representation in the general population. Disproportionality affects all systems such as the educational, mental health and judicial systems creating additional costs within these areas.
Comproportionation or symproportionation is a chemical reaction where two reactants, each containing the same element but with a different oxidation number, will form a product in which the elements involved reach the same oxidation number. Potassium permanganate contains manganese with oxidation number of +7 and reacts with a manganese compound having oxidation number +2 to yield manganese(IV) oxide (manganese dioxide) with oxidation number +4, potassium hydroxide and water.