needed vs required

needed and required both are adjectives.

Word	Noun	Adjective	Verb	Adverb
needed	No	Yes	No	No
required	No	Yes	No	No

As adjectives, needed and required are synonyms defined as:

Other synonyms of needed include needful, requisite.

needed (adjective)	required (adjective)
necessary for relief or supply	necessary for relief or supply
	required by rule