phrase vs expression

phrase and expression both are nouns.

Word	Noun	Adjective	Verb	Adverb
phrase	Yes	No	Yes	No
expression	Yes	No	No	No

As nouns, expression is a hypernym of phrase; that is, expression is a word with a broader meaning than phrase:

phrase: an expression consisting of one or more words forming a grammatical constituent of a sentence
expression: a group of words that form a constituent of a sentence and are considered as a single unit

Other hypernyms of phrase include construction, grammatical construction.

As nouns, expression is a hypernym of phrase; that is, expression is a word with a broader meaning than phrase:

phrase: an expression whose meanings cannot be inferred from the meanings of the words that make it up
expression: a word or phrase that particular people use in particular situations

Other hypernyms of phrase include locution, saying.

phrase (noun)	expression (noun)
dance movements that are linked in a single choreographic sequence	the act of forcing something out by squeezing or pressing
an expression consisting of one or more words forming a grammatical constituent of a sentence	the feelings expressed on a person's face
a short musical passage	a word or phrase that particular people use in particular situations
an expression whose meanings cannot be inferred from the meanings of the words that make it up	the style of expressing yourself
	expression without words
	a group of symbols that make a mathematical statement
	the communication (in speech or writing) of your beliefs or opinions
	a group of words that form a constituent of a sentence and are considered as a single unit
	(genetics) the process of expressing a gene

phrase (verb)	expression (verb)
put into words or an expression
divide, combine, or mark into phrases