subvocalize vs articulate

subvocalize is not an adjective while articulate is an adjective.

Word	Noun	Adjective	Verb	Adverb
subvocalize	No	No	Yes	No
articulate	No	Yes	Yes	No

As verbs, articulate is a hypernym of subvocalize; that is, articulate is a word with a broader meaning than subvocalize:

Other hypernyms of subvocalize include enounce, enunciate, pronounce, say, sound out.

subvocalize (adjective)	articulate (adjective)
	expressing yourself easily or characterized by clear expressive language
	consisting of segments held together by joints

subvocalize (verb)	articulate (verb)
articulate without making audible sounds	speak, pronounce, or utter in a certain way
	express or state clearly
	put into words or an expression
	provide with a joint
	unite by forming a joint or joints