splinter group vs faction

splinter group and faction both are nouns.

Word	Noun	Adjective	Verb	Adverb
splinter group	Yes	No	No	No
faction	Yes	No	No	No

As nouns, faction is a hypernym of splinter group; that is, faction is a word with a broader meaning than splinter group:

splinter group: a faction or sect that has broken away from its parent organization
faction: a dissenting clique

Other hypernyms of splinter group include sect.

splinter group (noun)	faction (noun)
a faction or sect that has broken away from its parent organization	a dissenting clique
	a clique (often secret) that seeks power usually through intrigue