leaf shape vs leaf form

leaf shape and leaf form both are nouns.

Word	Noun	Adjective	Verb	Adverb
leaf shape	Yes	No	No	No
leaf form	Yes	No	No	No

As nouns, leaf shape and leaf form are synonyms defined as:

leaf shape and leaf form: any of the various shape that leaves of plants can assume

leaf shape (noun)	leaf form (noun)
any of the various shape that leaves of plants can assume	any of the various shape that leaves of plants can assume