well-educated vs lettered

well-educated and lettered both are adjectives.

Word	Noun	Adjective	Verb	Adverb
well-educated	No	Yes	No	No
lettered	No	Yes	No	No

As adjectives, well-educated and lettered are synonyms defined as:

well-educated and lettered: highly educated; having extensive information or understanding

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

well-educated (adjective)	lettered (adjective)
highly educated; having extensive information or understanding	highly educated; having extensive information or understanding