lettered vs learned

lettered and learned both are adjectives.

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

As adjectives, lettered and learned are synonyms defined as:

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

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

lettered (adjective)	learned (adjective)
highly educated; having extensive information or understanding	established by conditioning or learning
	highly educated; having extensive information or understanding
	having or showing profound knowledge