cymograph vs kymograph

cymograph and kymograph both are nouns.

Word	Noun	Adjective	Verb	Adverb
cymograph	Yes	No	No	No
kymograph	Yes	No	No	No

As nouns, cymograph and kymograph are synonyms defined as:

cymograph and kymograph: scientific instrument consisting of a rotating drum holding paper on which a stylus traces a continuous record (as of breathing or blood pressure)

cymograph (noun)	kymograph (noun)
scientific instrument consisting of a rotating drum holding paper on which a stylus traces a continuous record (as of breathing or blood pressure)	scientific instrument consisting of a rotating drum holding paper on which a stylus traces a continuous record (as of breathing or blood pressure)