Synonym of the word 'Precept' is -

• Precept (noun):
English Meaning: A rule about how to behave or what to think.
Bangla Meaning: নৈতিক উপদেশ; নীতিবাক্য; হিতোপদেশ; অনুশাসন, বিধি; আচরণবিধি; বিধান।

Synonyms: Principle (নীতি), Rule (আইন) Law (আইন), Commandment (আদেশ), Doctrine (মতবাদ)। 
Antonyms: Ambiguity (দ্ব্যর্থকতা), Lawlessness (অনাচার), Unbelief (অবিশ্বাস), Equivocalness (দ্ব্যর্থহীনতা), Anarchy (নৈরাজ্য)।

Other Forms: Discrepant (adjective) বৈষম্যমূলক।
Example Sentence: 
1. To help others and to create the basis for benefit is the main precept for Mahayana.
2. He believed in all the Christian precepts.

Source: Lecture.