Select the INCORRECTLY spelt word.

Correct option is C

Option (c) is incorrectly spelt word.
Correct spelling is: rocketry – The branch of science and engineering concerned with the design and building of rockets. (रॉकेट विज्ञान)
Example: He is studying rocketry to become a space engineer.
Meanings of all the given options:
· (a) rogue: A dishonest or unprincipled person. (धूर्त व्यक्ति)
· (b) rocket: A missile or spacecraft powered by engines. (रॉकेट)
· (d) roaster: A person or device that roasts food. (भूनने वाला उपकरण)