phrasing vs diction

phrasing and diction both are nouns.

Word	Noun	Adjective	Verb	Adverb
phrasing	Yes	No	No	No
diction	Yes	No	No	No

As nouns, phrasing and diction are synonyms defined as:

phrasing and diction: the manner in which something is expressed in words

Other synonyms of phrasing include choice of words, phraseology, verbiage, wording.

phrasing (noun)	diction (noun)
the grouping of musical phrases in a melodic line	the manner in which something is expressed in words
the manner in which something is expressed in words	the articulation of speech regarded from the point of view of its intelligibility to the audience