whole to part relation vs holonymy

whole to part relation and holonymy both are nouns.

Word	Noun	Adjective	Verb	Adverb
whole to part relation	Yes	No	No	No
holonymy	Yes	No	No	No

As nouns, whole to part relation and holonymy are synonyms defined as:

whole to part relation and holonymy: the semantic relation that holds between a whole and its parts

whole to part relation (noun)	holonymy (noun)
the semantic relation that holds between a whole and its parts	the semantic relation that holds between a whole and its parts