Nouns

(n)remark, comment, inputa statement that expresses a personal opinion or belief or adds information“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”
(n)comment, commentarya written explanation or criticism or illustration that is added to a book or other textual material“he wrote an extended comment on the proposal”
(n)gossip, comment, scuttlebutta report (often malicious) about the behavior of other people“the divorce caused much gossip”

Verbs

(v)comment, notice, remark, point outmake or write a comment on“he commented the paper of his colleague”
(v)commentexplain or interpret something
(v)gloss, comment, annotateprovide interlinear explanations for words or phrases“He annotated on what his teacher had written”