What characteristics differentiate a spider-looking bug with 6 legs from other arachnids and insects?

A spider-looking bug with 6 legs is likely a member of the order Araneae, which includes true Spiders. This bug would be differentiated from other arachnids, such as scorpions and ticks, by its lack of a distinct body segmentation and the presence of silk-producing spinnerets. Insects, on the other hand, have three body segments and typically have antennae, which the spider-like bug would lack.