tautological vs redundant

tautological and redundant both are adjectives.

Word	Noun	Adjective	Verb	Adverb
tautological	No	Yes	No	No
redundant	No	Yes	No	No

As adjectives, tautological and redundant are synonyms defined as:

tautological and redundant: repetition of same and identical sense with different and non-identical words

Other synonyms of tautological include pleonastic, tautologic.

tautological (adjective)	redundant (adjective)
repetition of same and identical sense with different and non-identical words	more than is needed, desired, or required
	repetition of same and identical sense with different and non-identical words