second-guess vs comment

second-guess is not a noun while comment is a noun.

Word	Noun	Adjective	Verb	Adverb
second-guess	No	No	Yes	No
comment	Yes	No	Yes	No

As verbs, comment is a hypernym of second-guess; that is, comment is a word with a broader meaning than second-guess:

second-guess (noun)	comment (noun)
	a statement that expresses a personal opinion or belief or adds information
	a written explanation or criticism or illustration that is added to a book or other textual material
	a report (often malicious) about the behavior of other people

second-guess (verb)	comment (verb)
evaluate or criticize with hindsight	make or write a comment on
attempt to anticipate or predict	provide interlinear explanations for words or phrases
	explain or interpret something