operation vs D and C

operation and D and C both are nouns.

Word	Noun	Adjective	Verb	Adverb
operation	Yes	No	No	No
D and C	Yes	No	No	No

As nouns, D and C is a hyponym of operation; that is, D and C is a word with a more specific, narrower meaning than operation:

operation: a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body
D and C: a surgical procedure usually performed under local anesthesia in which the cervix is dilated and the endometrial lining of the uterus is scraped with a curet; performed to obtain tissue samples or to stop prolonged bleeding or to remove small tumors or to remove fragments of placenta after childbirth or as a method of abortion

operation (noun)	D and C (noun)
a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body	a surgical procedure usually performed under local anesthesia in which the cervix is dilated and the endometrial lining of the uterus is scraped with a curet; performed to obtain tissue samples or to stop prolonged bleeding or to remove small tumors or to remove fragments of placenta after childbirth or as a method of abortion
(mathematics) calculation by mathematical methods
activity by a military or naval force (as a maneuver or campaign)
a planned activity involving many people performing various actions
a process or series of acts especially of a practical or mechanical nature involved in a particular form of work
a business especially one run on a large scale
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