comment vs explain

comment is a noun but explain is not a noun.

Word	Noun	Adjective	Verb	Adverb
comment	Yes	No	Yes	No
explain	No	No	Yes	No

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

Other hypernyms of comment include explicate.

comment (noun)	explain (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

comment (verb)	explain (verb)
make or write a comment on	make plain and comprehensible
provide interlinear explanations for words or phrases	define
explain or interpret something	serve as a reason or cause or justification of