lettered vs knowledgeable

lettered and knowledgeable both are adjectives.

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

As adjectives, lettered and knowledgeable are synonyms defined as:

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

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

lettered (adjective)	knowledgeable (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