Example : She observed that his presentation took up too much time.
They noted that it was a fine day to go sailing.

Synonyms : mention, note, observe

Example : He commented the paper of his colleague.

Synonyms : comment, notice, point out

Example : From time to time she contributed a personal comment on his account.
We would appreciate input from our users on how we can improve our software.

Synonyms : comment, input

Example : It passed without remark.