It depends on the sentence. It can be an adjective or a noun.
Example of Twinkling as an Adjective:
Patrons can walk or drive through an amazing array of twinkling lights and sparkling displays.
Example of Twinkling as an Noun:
Some of you believe in possessions, well the knowledge in a twinkling of the eye did not take place here then did it.
See the related link.
adverb
what part of speech is work
i want to know what part of speech is camping
what part of speech is beneath
what part of speech is eleven
Twinkled
part of speech
The part of speech for this particular word is a noun.
what part of speech is beneath
what part of speech is work
adverb
twinkled
the part of speech sashay is a averb
"Did not" or "didn't" is a contraction of the auxiliary verb "did" and the adverb "not," forming a negative past tense construction in English.
The word speech is a noun.
Adjective
Yes, a proper noun is a type of noun that specifically names a unique person, place, thing, or idea and is typically capitalized. It is part of the broader category of nouns in the classification of parts of speech in grammar.