chromesthesia vs synaesthesia

chromesthesia and synaesthesia both are nouns.

Word	Noun	Adjective	Verb	Adverb
chromesthesia	Yes	No	No	No
synaesthesia	Yes	No	No	No

As nouns, synaesthesia is a hypernym of chromesthesia; that is, synaesthesia is a word with a broader meaning than chromesthesia:

chromesthesia: a form of synesthesia in which nonvisual stimulation results in the experience of color sensations
synaesthesia: a sensation that normally occurs in one sense modality occurs when another modality is stimulated

Other hypernyms of chromesthesia include synesthesia.

chromesthesia (noun)	synaesthesia (noun)
a form of synesthesia in which nonvisual stimulation results in the experience of color sensations	a sensation that normally occurs in one sense modality occurs when another modality is stimulated