Here's why:
* Noun: A motif is a recurring element, idea, or image in a literary work, artistic work, or design.
* Example: "The recurring motif of water in the poem symbolizes rebirth."
* Verb (rare): It can be used as a verb meaning "to decorate with a motif." This usage is less common.
* Example: "The artist motived the tapestry with floral designs."
* Adjective (rare): There's no common adjective form of "motif," but you could technically use "motifal" as an adjective, but it's quite uncommon and sounds very artificial.
In summary: "Motif" is most commonly used as a noun. While it has a verb form, it's not widely used.