teensy-weensy vs itty-bitty

teensy-weensy and itty-bitty both are adjectives.

Word	Noun	Adjective	Verb	Adverb
teensy-weensy	No	Yes	No	No
itty-bitty	No	Yes	No	No

As adjectives, teensy-weensy and itty-bitty are synonyms defined as:

Other synonyms of teensy-weensy include bittie, bitty, itsy-bitsy, teensy, teentsy, teeny-weeny, teeny, wee, weensy, weeny.

teensy-weensy (adjective)	itty-bitty (adjective)
(used informally) little or tiny	(used informally) little or tiny