articulation vs articular

articulation is a noun but articular is not a noun.

Word	Noun	Adjective	Verb	Adverb
articulation	Yes	No	No	No
articular	No	Yes	No	No

articulation (noun)	articular (noun)
the act of joining things in such a way that motion is possible
(anatomy) the point of connection between two bones or elements of a skeleton (especially if it allows motion)
the aspect of pronunciation that involves bringing articulatory organs together so as to shape the sounds of speech
expressing in coherent verbal form
the shape or manner in which things come together and a connection is made

articulation (adjective)	articular (adjective)
	relating to or affecting the joints of the body