letter-perfect vs word-perfect

letter-perfect and word-perfect both are adjectives.

Word	Noun	Adjective	Verb	Adverb
letter-perfect	No	Yes	No	No
word-perfect	No	Yes	No	No

As adjectives, letter-perfect and word-perfect are synonyms defined as:

letter-perfect and word-perfect: correct to the last detail; especially being in or following the exact words

letter-perfect (adjective)	word-perfect (adjective)
correct to the last detail; especially being in or following the exact words	correct to the last detail; especially being in or following the exact words