afterthought vs reconsideration

afterthought and reconsideration both are nouns.

Word	Noun	Adjective	Verb	Adverb
afterthought	Yes	No	No	No
reconsideration	Yes	No	No	No

As nouns, afterthought and reconsideration are synonyms defined as:

afterthought and reconsideration: thinking again about a choice previously made

Other synonyms of afterthought include rethink, second thought.

afterthought (noun)	reconsideration (noun)
an addition that was not included in the original plan	thinking again about a choice previously made
thinking again about a choice previously made	a consideration of a topic (as in a meeting) with a view to changing an earlier decision