barbel vs tentacle

barbel and tentacle both are nouns.

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

As nouns, tentacle is a hypernym of barbel; that is, tentacle is a word with a broader meaning than barbel:

barbel: slender tactile process on the jaws of a fish
tentacle: 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

barbel (noun)	tentacle (noun)
slender tactile process on the jaws of a fish	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