phrasal idiom vs idiomatic expression

phrasal idiom and idiomatic expression both are nouns.

Word	Noun	Adjective	Verb	Adverb
phrasal idiom	Yes	No	No	No
idiomatic expression	Yes	No	No	No

As nouns, phrasal idiom and idiomatic expression are synonyms defined as:

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

Other synonyms of phrasal idiom include idiom, phrase, set phrase.

phrasal idiom (noun)	idiomatic expression (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