An honest manis ultimately rewarded. The underlined part of the sentence is a/an -

A noun phrase consists of a pronoun or noun and any associated modifiers, including adjectives, adjective phrases, adjective clauses and other nouns in the possessive case.
এখানে বাক্যের subject হিসেবে কাজ করেছে বিধায় উক্ত phrase টি noun phrase.

অধিকাংশ সময়ই, Noun phrase  মূলত: একটি Noun বা Pronoun এর কাজ করে। 

এছাড়া, অর্থ এবং বাক্যে অবস্থান অনুযায়ী Noun phrase বিভিন্ন ভূমিকা পালন করে । যেমন: 
- Subject হিসেবে: Small children often insist that they can do things by themselves.

- Object of a verb হিসেবে: He wrote several successful short-stories. 

- Object of a preposition হিসেবে: The Arctic explorers were caught unaware by the spring breakup.

- Subjective complement হিসেবে: Frankenstein is the name of the scientist, not the monster.

- Objective complement হিসেবে: consider Loki my favorite cat.