well-tried vs tested

well-tried and tested both are adjectives.

Word	Noun	Adjective	Verb	Adverb
well-tried	No	Yes	No	No
tested	No	Yes	No	No

As adjectives, well-tried and tested are synonyms defined as:

Other synonyms of well-tried include tried.

well-tried (adjective)	tested (adjective)
tested and proved useful or correct	tested and proved useful or correct
	tested and proved to be reliable