developed vs highly-developed

developed and highly-developed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
developed	No	Yes	No	No
highly-developed	No	Yes	No	No

As adjectives, developed and highly-developed are synonyms defined as:

developed and highly-developed: (used of societies) having high industrial development

developed (adjective)	highly-developed (adjective)
being changed over time so as to be e.g. stronger or more complete or more useful	(used of societies) having high industrial development
(of real estate) made more useful and profitable as by building or laying out roads
(used of societies) having high industrial development