From my understanding a sport climb usually refers to routes with bolts only. However ive been browsing some of the San Diego area sport climbs on this site and when I look at the protection section I see alot of entries that say something like "Bolts and Medium Pro" however the climb is labeled only "sport".
Also I see alot of other climbs classified as Trad / Sport which I guess either means you can climb it in either style? or it requires a mixture of trad gear and some bolts...? How is this any different than the "sport" climbs that require some gear.
I know some people get confused when they see an old climb with bolts, but they are like 30'+ apart and think it's a sport climb, but it is actually still considered a traditional line. From my understanding a standard "sport" climb has bolted protection spaced 6' to 10' apart. If you need to place gear also it should be labeled a "sport/trad". Some label it "mixed" But mixed climbing is also when you climb using crampons and picks on rock and ice like this.
Therefore I believe it's better when they are labeled "sport/trad to cause less confusion.
Many climbs can't be accurately described with a 1-2 word label. One definition of trad is not guaranteed to match another. Read the details and usually you can figure it out. Another example - the ACSD guide just says g for some routes, indicating gear is needed.