Is miles an abstract noun

Answer 1

The noun 'miles' (lower case m) is a common noun, the plural form of the noun 'mile', a general word for a measurement of distance.

The noun 'Miles' (capital M) is a proper noun, the name of a specific person; for example, Miles Davis (American jazz musician) or Sarah Miles (English theatre and film actress).

Answer 2

No, it's referring to a concrete, measurable thing (unless, of course, you're saying something like "we have miles to go")

Answer 3

No, the noun kilometers (kilometres) is a concrete noun, the plural form of the singular noun kilometer, a word for a linear measurement, a word for a physical thing.

Answer 4

Common noun

But if it’s the name then it’s a proper nouns.