Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun afterthought

2 senses of afterthought

Sense 1
reconsideration, second thought, afterthought, rethink -- (thinking again about a choice previously made; "he had second thoughts about his purchase")
       => reversal, change of mind, flip-flop, turnabout, turnaround -- (a decision to reverse an earlier decision)

Sense 2
afterthought -- (an addition that was not included in the original plan; "the garage was an afterthought")
       => addition, add-on, improver -- (a component that is added to something to improve it; "the addition of a bathroom was a major improvement"; "the addition of cinnamon improved the flavor")