Follow-on and Follow-up

Follow-on noun - An immediate second innings forced on a cricket team scoring a prescribed number of runs fewer than its opponents in the first innings.

Follow-up and follow-on are semantically related. In some cases you can use "Follow-up" instead a noun phrase "Follow-on".

Follow-up noun - A piece of work that exploits or builds on earlier work.

Follow-on and follow-up are semantically related. Sometimes you can use "Follow-on" instead a noun phrase "Follow-up".