Phonaesthesia vs. Synaesthesia: What's the Difference?

Phonaesthesia and Synaesthesia Definitions
Phonaesthesia
(linguistics) Any correspondence between the sound of a word and its meaning; examples include onomatopoeia and the use of phonaesthemes.
Synaesthesia
Variant of synesthesia.
Synaesthesia
A neurological or psychological phenomenon whereby a particular sensory stimulus triggers a second kind of sensation.
Synaesthesia
(by extension) The association of one sensory perception with, or description of it in terms of, a different perception that is not experienced at the same time.
Synaesthesia
A literary or artistic device whereby one kind of sensation is described in the terms of another.
ADVERTISEMENT
Synaesthesia
A sensation that normally occurs in one sense modality occurs when another modality is stimulated