knowledgeable vs lettered

knowledgeable and lettered both are adjectives.

Word	Noun	Adjective	Verb	Adverb
knowledgeable	No	Yes	No	No
lettered	No	Yes	No	No

As adjectives, knowledgeable and lettered are synonyms defined as:

knowledgeable and lettered: highly educated; having extensive information or understanding

Other synonyms of knowledgeable include knowing, learned, well-educated, well-read.

knowledgeable (adjective)	lettered (adjective)
highly educated; having extensive information or understanding	highly educated; having extensive information or understanding
thoroughly acquainted through study or experience
alert and fully informed