Parkinson's law vs observation

Parkinson's law and observation both are nouns.

Word	Noun	Adjective	Verb	Adverb
Parkinson's law	Yes	No	No	No
observation	Yes	No	No	No

Parkinson's law (noun)	observation (noun)
C. Northcote Parkinson's cynical observation that the number of subordinates in an organization will increase linearly regardless of the amount of work to be done	the act of observing; taking a patient look
C. Northcote Parkinson's cynical observation that work will expand so as to fill the time available for its completion	the act of making and recording a measurement
	the act of noticing or paying attention
	facts learned by observing
	a remark expressing careful consideration