chine vs rachis

chine and rachis both are nouns.

Word	Noun	Adjective	Verb	Adverb
chine	Yes	No	Yes	No
rachis	Yes	No	No	No

As nouns, rachis is a hypernym of chine; that is, rachis is a word with a broader meaning than chine:

chine: backbone of an animal
rachis: the series of vertebrae forming the axis of the skeleton and protecting the spinal cord

Other hypernyms of chine include back, backbone, spinal column, spine, vertebral column.

chine (noun)	rachis (noun)
backbone of an animal	the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
cut of meat or fish including at least part of the backbone	axis of a compound leaf or compound inflorescence

chine (verb)	rachis (verb)
cut through the backbone of an animal