On the button and Well timed

On the button adjective - Being precise with regard to a prescribed or specified criterion.

Well timed and on the button are semantically related In some cases you can replace phrase "Well timed" with "On the button", this phrases are similar.

Well timed adjective - Done or happening at the appropriate or proper time.

On the button and well timed are semantically related in suitable topic. Sometimes you can use "On the button" instead an adjective phrase "Well timed".