As nouns the difference between merism and verism
is that merism is referring to something by its polar extremes, as in "we searched high and low" while verism is presenting common, everyday subjects, specifically eschewing the heroic or legendary.
merism
English
Noun
(literature, rhetoric) Referring to something by its polar extremes, as in "we searched high and low".
(literature, rhetoric) Referring to something by a list of its parts.
verism
English
Noun
(
en noun)
(arts, literature) Presenting common, everyday subjects, specifically eschewing the heroic or legendary.
(arts) A movement in the late 19th century, related to realism