Roll and Undulation

Roll noun - A record of a series of items (as names or titles) usually arranged according to some system.

Undulation and roll are semantically related in turn topic. In some cases you can use "Undulation" instead a noun "Roll", when it comes to topics like waves, revolving.

Nearby Words: rolled, rolling, roller, rollback, rollover

Undulation noun - Wavelike motion; a gentle rising and falling in the manner of waves.

Roll and undulation are semantically related in wave topic. You can use "Roll" instead a noun "Undulation".

Nearby Words: undulate, undulated, undulating