diminutive vs petite

diminutive and petite both are nouns.

Word	Noun	Adjective	Verb	Adverb
diminutive	Yes	Yes	No	No
petite	Yes	Yes	No	No

As adjectives, diminutive and petite are synonyms defined as:

Other synonyms of diminutive include bantam, flyspeck, lilliputian, midget, tiny.

diminutive (noun)	petite (noun)
a word that is formed with a suffix (such as -let or -kin) to indicate smallness	a garment size for short or slender women

diminutive (adjective)	petite (adjective)
very small	very small