Question

what is the abstract noun for captain

Answer 1

The abstract noun for captain is captaincy. A noun is the name of a person, place or thing. Nouns can be abstract or concrete. Abstract nouns are intangible and cannot be experienced with the five senses. You cannot see, smell, taste, hear, or touch an abstract noun. It denotes an aspect, concept, experience, idea, state of being, quality, trait, feeling. In other words, abstract noun is the name of a quality, state or action. While, concrete nouns are tangible and can be experienced with the five senses. 

Answer 2

An abstract noun is usually the name of a quality, action, or state, considered apart from the object to which it belongs.

Abstract nouns are formed from adjectives, from verbs and from common noun.

Here captain is a common noun and its abstract noun is captaincy/ captainship.