phrasal idiom vs set phrase

phrasal idiom and set phrase both are nouns.

Word	Noun	Adjective	Verb	Adverb
phrasal idiom	Yes	No	No	No
set phrase	Yes	No	No	No

As nouns, phrasal idiom and set phrase are synonyms defined as:

phrasal idiom and set phrase: an expression whose meanings cannot be inferred from the meanings of the words that make it up

Other synonyms of phrasal idiom include idiom, idiomatic expression, phrase.

phrasal idiom (noun)	set phrase (noun)
an expression whose meanings cannot be inferred from the meanings of the words that make it up	an expression whose meanings cannot be inferred from the meanings of the words that make it up