Learn Farsi: ما امروز هم‌مسیر بودیم.

It uses the prefix هم (ham-), which means same or together, attached to the noun مسیر (masir), meaning route, path, or direction. Together, they literally mean sharing the same route.

Is هم‌مسیر a noun or an adjective here?

In this sentence, it acts as an adjective describing the subject ما (we). Combined with the verb بودیم (we were), the sentence literally translates to We were same-route today.

Why is there a small gap in the middle of هم‌مسیر?

That is a half-space. It keeps the prefix هم visually separate from the noun مسیر to make the compound word easier to read. You will often see words starting with هم written this way, though occasionally they are joined completely.

Why does امروز (today) come before هم‌مسیر?

In Farsi, time words like امروز usually come early in the sentence, typically right after the subject. The main descriptive phrase and the verb (هم‌مسیر بودیم) are kept together at the very end of the sentence.