articular vs articulation

articular is not a noun while articulation is a noun.

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

articular (noun)	articulation (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

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