highly-developed vs developed

highly-developed and developed both are adjectives.

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

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

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

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