In American English, at least:
"Travel" is usually a verb, though it can also be a verbal noun. As a verb, it indicates the general process of moving from one place to another. You can travel from Paris to Berlin. News can travel from neighbor to neighbor. An airplane can travel quickly. As a noun, I think "travel" is a gerund from which we drop the "-ing". "I enjoy travel" is a shortened way of saying, "I enjoy traveling." In that sense, it means something like "I enjoy going to new places, seeing new things, meeting new people, etc."
"Journey" is almost always a noun. It refers to the time period and experiences of a given instance of traveling, especially one that is long and/or challenging. In everyday speech, it is often used metaphorically: My language-learning journey, my journey through grief, memory = "a journey through time." Most Americans won't refer to, say, a trip to Europe as a journey. I think in other English-speaking countries, that use of journey is more common."Journey" can also be a verb, though I don't hear it used very often. It sounds a bit formal and old-fashioned.
I hope that helps!