Arduino is an open-source hardware and software company, project, and user community that designs and manufactures single-board microcontrollers for building digital devices.
NodeMCU is a microcontroller development board with wifi capability. It uses an ESP8266 microcontroller chip. Whereas Arduino UNO uses an ATMega328P microcontroller.
CAN NODEMCU BE USED AS ARDUINO?
The answer is YES. As same code can be used for both the microcontrollers when programming using Arduino IDE. But there will be some limitations like Voltage, Current.
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Both the boards are best when used in the right place. So choose the one according to your technical requirement.