actinoid vs grouping

actinoid and grouping both are nouns.

Word	Noun	Adjective	Verb	Adverb
actinoid	Yes	Yes	No	No
grouping	Yes	No	No	No

As nouns, grouping is a hypernym of actinoid; that is, grouping is a word with a broader meaning than actinoid:

actinoid: any of a series of radioactive elements with atomic numbers 89 through 103
grouping: any number of entities (members) considered as a unit

Other hypernyms of actinoid include group.

actinoid (noun)	grouping (noun)
any of a series of radioactive elements with atomic numbers 89 through 103	any number of entities (members) considered as a unit
	the activity of putting things together in groups
	a system for classifying things into groups

actinoid (adjective)	grouping (adjective)
having a radial form