tentacle vs tentacular

tentacle is a noun but tentacular is not a noun.

Word	Noun	Adjective	Verb	Adverb
tentacle	Yes	No	No	No
tentacular	No	Yes	No	No

tentacle (noun)	tentacular (noun)
any of various elongated tactile or prehensile flexible organs that occur on the head or near the mouth in many animals; used for feeling or grasping or locomotion
something that acts like a tentacle in its ability to grasp and hold

tentacle (adjective)	tentacular (adjective)
	of or relating to or resembling tentacles