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 : input, remark

Example : He wrote an extended comment on the proposal.

Synonyms : commentary

Example : The divorce caused much gossip.

Synonyms : gossip, scuttlebutt

Example : He commented the paper of his colleague.

Synonyms : notice, point out, remark

Example : He annotated on what his teacher had written.

Synonyms : annotate, gloss