comment vs pipeline

comment and pipeline both are nouns.

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

As nouns, pipeline is a hyponym of comment; that is, pipeline is a word with a more specific, narrower meaning than comment:

comment (noun)	pipeline (noun)
a statement that expresses a personal opinion or belief or adds information	a pipe used to transport liquids or gases
a written explanation or criticism or illustration that is added to a book or other textual material	gossip spread by spoken communication
a report (often malicious) about the behavior of other people

comment (verb)	pipeline (verb)
make or write a comment on
provide interlinear explanations for words or phrases
explain or interpret something