drag coefficient vs coefficient

drag coefficient and coefficient both are nouns.

Word	Noun	Adjective	Verb	Adverb
drag coefficient	Yes	No	No	No
coefficient	Yes	No	No	No

As nouns, coefficient is a hypernym of drag coefficient; that is, coefficient is a word with a broader meaning than drag coefficient:

drag coefficient: the ratio of the drag on a body moving through air to the product of the velocity and the surface area of the body
coefficient: a constant number that serves as a measure of some property or characteristic

drag coefficient (noun)	coefficient (noun)
the ratio of the drag on a body moving through air to the product of the velocity and the surface area of the body	a constant number that serves as a measure of some property or characteristic