Should photo keywords use singular or plural nouns?

There isn’t a strict universal rule; consistency matters more than whether you choose singular or plural.

A common approach is to use singular nouns (for example, “bridge,” “mountain,” “bird”) because they act as the most general form of the keyword and are easy to search from. Another valid way to think about tags is as “containers” of images, in which case plurals can also make sense.

The most important question is how you plan to retrieve photos later. If your software or workflow handles stemming or broad keyword searches well, either form may work fine. If not, choosing one standard and sticking to it will make your catalog easier to search and maintain.

In practice, many photographers prefer singular tags for subject names, then add other descriptive keywords for traits, location, activity, or number when needed. Whatever you choose, avoid mixing forms randomly unless your DAM software automatically normalizes them.