pleonastic vs tautological

pleonastic and tautological both are adjectives.

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

As adjectives, pleonastic and tautological are synonyms defined as:

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

Other synonyms of pleonastic include redundant, tautologic.

pleonastic (adjective)	tautological (adjective)
repetition of same and identical sense with different and non-identical words	repetition of same and identical sense with different and non-identical words