Domino effect and Domino theory

Domino effect noun - The consequence of one event setting off a chain of similar events (like a falling domino causing a whole row of upended dominos to fall).

Domino theory and domino effect are semantically related. In some cases you can use "Domino theory" instead a noun phrase "Domino effect".

Domino theory noun - The political theory that if one nation comes under communist control then neighboring nations will also come under communist control.

Domino effect and domino theory are semantically related. Sometimes you can replace phrase "Domino effect" with "Domino theory", this phrases are similar.