secret plan vs cabal

secret plan and cabal both are nouns.

Word	Noun	Adjective	Verb	Adverb
secret plan	Yes	No	No	No
cabal	Yes	No	Yes	No

As nouns, cabal is a hyponym of secret plan; that is, cabal is a word with a more specific, narrower meaning than secret plan:

secret plan: a secret scheme to do something (especially something underhand or illegal)
cabal: a plot to carry out some harmful or illegal act (especially a political plot)

Other hyponyms of secret plan include counterplan, counterplot, intrigue, machination, conspiracy.

secret plan (noun)	cabal (noun)
a secret scheme to do something (especially something underhand or illegal)	a plot to carry out some harmful or illegal act (especially a political plot)
	a clique (often secret) that seeks power usually through intrigue

secret plan (verb)	cabal (verb)
	engage in plotting or enter into a conspiracy, swear together