hotspot

As a noun hotspot

is hot spot.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between focus and hotspot

is that focus is (countable|optics) a point at which reflected or refracted rays of light converge while hotspot is hot spot.

As a verb focus

is to cause (rays of light, etc) to converge at a single point.

As nouns the difference between hotspot and density

is that hotspot is hot spot while density is (physics) a measure of the amount of matter contained by a given volume.

As nouns the difference between epicenter and hotspot

is that epicenter is (us) while hotspot is hot spot.

As nouns the difference between hotspot and router

is that hotspot is an alternative spelling of lang=en while router is someone who routes or directs items from one location to another.

As a verb router is

to hollow out or cut using a router power tool.

As nouns the difference between wifi and hotspot

is that wifi is while hotspot is hot spot.

As nouns the difference between hotspot and cluster

is that hotspot is an alternative spelling of lang=en while cluster is a group or bunch of several discrete items that are close to each other.

As a verb cluster is

to form a cluster or group.

As nouns the difference between epicentre and hotspot

is that epicentre is epicentre while hotspot is hot spot.

As a noun hotspot is

hot spot.