observation vs remark

observation and remark both are nouns.

Word	Noun	Adjective	Verb	Adverb
observation	Yes	No	No	No
remark	Yes	No	Yes	No

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

Other hyponyms of observation include mind.

As nouns, remark is a hypernym of observation; that is, remark is a word with a broader meaning than observation:

observation: a remark expressing careful consideration
remark: a statement that expresses a personal opinion or belief or adds information

Other hypernyms of observation include comment, input.

observation (noun)	remark (noun)
the act of observing; taking a patient look	explicit notice
the act of making and recording a measurement	a statement that expresses a personal opinion or belief or adds information
the act of noticing or paying attention
facts learned by observing
a remark expressing careful consideration

observation (verb)	remark (verb)
	make mention of
	make or write a comment on