noticed

As a letter s

is the letter s with a.

As a verb noticed is

(notice).

As verbs the difference between noticed and reviewed

is that noticed is (notice) while reviewed is (review).

As verbs the difference between noticed and review

is that noticed is (notice) while review is to survey; to look broadly over.

As a noun review is

a second or subsequent reading of a text or artifact.

As verbs the difference between witnessed and noticed

is that witnessed is (witness) while noticed is (notice).

As verbs the difference between informed and noticed

is that informed is (inform) while noticed is (notice).

As an adjective informed

is instructed; having knowledge of a fact or area of education or informed can be (obsolete) unformed or ill-formed; deformed; shapeless.

As verbs the difference between noticed and knew

is that noticed is (notice) while knew is (know).

As a verb noticed

is (notice).

As an adjective undefined is

lacking a definition or value.

As verbs the difference between noticed and reported

is that noticed is (notice) while reported is (report).

As verbs the difference between recognise and noticed

is that recognise is to match something or someone which one currently perceives to a memory of some previous encounter with the same entity while noticed is (notice).