We practice compound nouns a lot, but ow often do we talk about open compound nouns? My students tend to have trouble identifying open compounds as nouns. They like to label them as two separate nouns or, more often, as an adjective and a noun. This is the digital version of my open compound noun dominoes, created to help students practice some of them ore common open compounds. Since there is sometimes controversy over whether a compound noun should be closed, hyphenated, or open I let Merriam