1. (Common Noun-Common &/or Masculine) Mechanism to control or alter speed, quantity, etc.

English: controller, regulator,
Assamese: নিয়ন্ত্ৰক, নিয়ামক

Different POS:

a. Verbal Noun: control, নিয়ন্ত্ৰণ, সম্বৰণ, हमथा, ka bor...