As an adverb, "well" describes how something is done ("she sings well"). As an interjection, it opens a sentence to signal a pause or feeling ("Well, let's see") and adds no grammatical meaning — remove it and the sentence still works.
Adverb: answers 'how?' — 'she sings well'.
Interjection: sentence opener + comma — 'Well, let's see.'
Bonus adjective: 'I'm well' = healthy.
Removable without breaking the sentence → it was the interjection.
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Same word, three different jobs:
Adverb — describes how something is done: "She sings well." "The plan worked well." (It answers "how?")
Interjection — a sentence opener that signals a pause, hesitation or transition, always followed by a comma: "Well, let's see." "Well, that was unexpected!" (It carries feeling