idiomatic expression vs phrasal idiom

idiomatic expression and phrasal idiom both are nouns.

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

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

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

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

idiomatic expression (noun)	phrasal idiom (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