The noun 'border' is a singular common noun.
The noun 'border' is a concrete noun as a word for the edge of something or decoration along the edge of something.
The noun 'border' is an abstract noun as a word for a line separating two political or geographical areas.
part of speech
Adjective
What part of speech is thaw
The part of speech for oscillate is verb.
An adjective is a part of speech.
part of speech
The part of speech for this particular word is a noun.
adverb
what part of speech is beneath
The part of speech for "answer" is a noun.
The part of speech for "explicit" is an adjective.
The part of speech for "unfamiliar" is an adjective.
The part of speech for "indefinite" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "breezy" is an adjective.
The part of speech for "buried" is a verb.
The part of speech for "rapid" is an adjective.