itty-bitty vs weeny

itty-bitty and weeny both are adjectives.

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

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

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

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