rattle vs ruckle

rattle is a noun but ruckle is not a noun.

Word	Noun	Adjective	Verb	Adverb
rattle	Yes	No	Yes	No
ruckle	No	No	Yes	No

As verbs, ruckle is a hyponym of rattle; that is, ruckle is a word with a more specific, narrower meaning than rattle:

Other hyponyms of rattle include crackle, crepitate.

rattle (noun)	ruckle (noun)
loosely connected horny sections at the end of a rattlesnake's tail
a baby's toy that makes percussive noises when shaken
a rapid series of short loud sounds (as might be heard with a stethoscope in some types of respiratory disorders)

rattle (verb)	ruckle (verb)
shake and cause to make a rattling noise	make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in; `crisp' is archaic
make short successive sounds	make a hoarse, rattling sound