ruralism vs phrasal idiom

ruralism and phrasal idiom both are nouns.

Word	Noun	Adjective	Verb	Adverb
ruralism	Yes	No	No	No
phrasal idiom	Yes	No	No	No

As nouns, phrasal idiom is a hypernym of ruralism; that is, phrasal idiom is a word with a broader meaning than ruralism:

ruralism: a rural idiom or expression
phrasal idiom: an expression whose meanings cannot be inferred from the meanings of the words that make it up

Other hypernyms of ruralism include idiom, idiomatic expression, phrase, set phrase.

ruralism (noun)	phrasal idiom (noun)
a rural characteristic or trait	an expression whose meanings cannot be inferred from the meanings of the words that make it up
a rural idiom or expression
Advocacy of rural life instead of urbanism or city living.