The word either can be an adjective. Another word to use is whichever.
Either is not an adjective. It has no degrees.
The word constant can be used as either a noun or an adjective, to describe something that is essentially unchanging.
NO because contribute can either be a noun or verb.
Depending on how it is used a number can be either a verb or an adjective.
The word "hard" can be either an adjective or an adverb. E.g. Concrete is hard. It was a hard test. (adjective) He works hard at his job. Push hard on the button. (adverb)
It can either be a verb or a adjective.
No, cough is not an adjective. It can be either a noun or a verb.
It can be either an adjective or a noun depends on the meaning.
Either is not an adjective. It has no degrees.
It depends on how it is used. It can be either a noun or an adjective.
Yes, it can be either an adjective or an adverb, meaning near, close by.
The word "for" is not an adjective of any kind. It is either a preposition or a conjunction.
The word "when" is never an adjective. It is either an adverb, conjunction, noun, or pronoun.
The word these can be a pronoun or an adjective. In either use, it is the plural form of this.
It is either an adjective (intelligent, stylish) or a verb (to hurt or ache).
No, 'gait' can be either a noun or a verb. The adjective would be 'gaited'.
Coming can be either an adjective ("this coming Thursday") or a noun ("the coming of spring").