centroid vs center of mass

centroid and center of mass both are nouns.

Word	Noun	Adjective	Verb	Adverb
centroid	Yes	No	No	No
center of mass	Yes	No	No	No

As nouns, center of mass is a hypernym of centroid; that is, center of mass is a word with a broader meaning than centroid:

centroid: the center of mass of an object of uniform density
center of mass: point representing the mean position of the matter in a body

Other hypernyms of centroid include centre of mass.

centroid (noun)	center of mass (noun)
the center of mass of an object of uniform density	point representing the mean position of the matter in a body