lanthanide vs grouping

lanthanide and grouping both are nouns.

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

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

lanthanide: any element of the lanthanide series (atomic numbers 57 through 71)
grouping: any number of entities (members) considered as a unit

Other hypernyms of lanthanide include group.

lanthanide (noun)	grouping (noun)
any element of the lanthanide series (atomic numbers 57 through 71)	any number of entities (members) considered as a unit
	the activity of putting things together in groups
	a system for classifying things into groups