Squib and Teach-in

Squib noun - Firework consisting of a tube filled with powder (as a broken firecracker) that burns with a fizzing noise.

Teach-in and squib are semantically related. In some cases you can use "Teach-in" instead a noun "Squib".

Teach-in noun - An extended session (as on a college campus) for lectures and discussion on an important and usually controversial issue.

Squib and teach-in are semantically related. Sometimes you can use "Squib" instead a noun phrase "Teach-in".