teeny vs itty-bitty

teeny and itty-bitty both are adjectives.

Word	Noun	Adjective	Verb	Adverb
teeny	No	Yes	No	No
itty-bitty	No	Yes	No	No

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

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

teeny (adjective)	itty-bitty (adjective)
(used informally) little or tiny	(used informally) little or tiny