itsy-bitsy vs teeny

itsy-bitsy and teeny both are adjectives.

Word	Noun	Adjective	Verb	Adverb
itsy-bitsy	No	Yes	No	No
teeny	No	Yes	No	No

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

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

itsy-bitsy (adjective)	teeny (adjective)
(used informally) little or tiny	(used informally) little or tiny