chunky heel vs block heel

chunky heel and block heel both are nouns.

Word	Noun	Adjective	Verb	Adverb
chunky heel	Yes	No	No	No
block heel	Yes	No	No	No

As nouns, chunky heel and block heel are synonyms defined as:

chunky heel and block heel: A type of wide heel that is usually square; comes in various heights.

chunky heel (noun)	block heel (noun)
A type of wide heel that is usually square; comes in various heights.	A type of wide heel that is usually square; comes in various heights.