Is lieutenant an abstract noun

Answer 1

The noun 'support' is an abstract noun as a word for financial or emotional assistance; a word for technical assistance; a word for a concept.

The noun 'support' is a concrete noun as a word for a thing that holds something upright or bears the weight of something; a word for a physical object.

The noun 'lieutenant' is a concrete noun as a word for a person.

Answer 2

The noun 'lieutenant' can be an abstract noun for a rank or position, a lieutenancy.

A lieutenant meaning a man or woman, an officer, is a concrete noun, a person.