Trilogy and Three

Trilogy noun - A set of three literary or dramatic works related in subject or theme.

Three and trilogy are semantically related in trio topic. In some cases you can use "Three" instead a noun "Trilogy", when it comes to topics like three of something.

Three noun - The cardinal number that is the sum of one and one and one.

Trilogy and three are semantically related in trio topic. You can use "Trilogy" instead a noun "Three", if it concerns topics such as three of something.