remark vs observation

remark and observation both are nouns.

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

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

Other hypernyms of remark include notice, observance.

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

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

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

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