Can memoriam be used as a noun?

Yes, "memoriam" can be used as a noun, but it's not a common or standard use. It's most commonly used as part of the phrase "in memoriam", which is a Latin phrase meaning "in memory of" and is used as an adjective phrase to indicate that something is dedicated to the memory of someone who has died.

Here's an example:

* "The memorial garden was created in memoriam of the fallen soldiers."

However, "memoriam" can sometimes be used as a noun, usually referring to a written or printed notice or tribute to someone who has died. This usage is less common and may be considered somewhat archaic or formal.

Here's an example:

* "The newspaper published a memoriam for the renowned artist."

It's important to note that using "memoriam" as a noun on its own might not be universally understood and could sound awkward to some.

In most cases, it's best to stick to the traditional usage of "in memoriam" as an adjective phrase.