operation vs activity

operation and activity both are nouns.

Word	Noun	Adjective	Verb	Adverb
operation	Yes	No	No	No
activity	Yes	No	No	No

As nouns, activity is a hypernym of operation; that is, activity is a word with a broader meaning than operation:

operation: activity by a military or naval force (as a maneuver or campaign)
activity: any specific behavior

As nouns, activity is a hypernym of operation; that is, activity is a word with a broader meaning than operation:

operation: a planned activity involving many people performing various actions
activity: any specific behavior

As nouns, activity is a hypernym of operation; that is, activity is a word with a broader meaning than operation:

As nouns, activity is a hypernym of operation; that is, activity is a word with a broader meaning than operation:

Other hypernyms of operation include action, activeness.

operation (noun)	activity (noun)
a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body	any specific behavior
(mathematics) calculation by mathematical methods	the trait of being active; moving or acting rapidly and energetically
activity by a military or naval force (as a maneuver or campaign)	an organic process that takes place in the body
a planned activity involving many people performing various actions	a process existing in or produced by nature (rather than by the intent of human beings)
a process or series of acts especially of a practical or mechanical nature involved in a particular form of work	the state of being active
a business especially one run on a large scale	(chemistry) the capacity of a substance to take part in a chemical reaction
the activity of operating something (a machine or business etc.)
(psychology) the performance of some composite cognitive activity; an operation that affects mental contents
(computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction)
process or manner of functioning or operating
the state of being in effect or being operative