itsy-bitsy vs teensy-weensy

itsy-bitsy and teensy-weensy both are adjectives.

Word	Noun	Adjective	Verb	Adverb
itsy-bitsy	No	Yes	No	No
teensy-weensy	No	Yes	No	No

As adjectives, itsy-bitsy and teensy-weensy are synonyms defined as:

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

itsy-bitsy (adjective)	teensy-weensy (adjective)
(used informally) little or tiny	(used informally) little or tiny